{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_new(int[] list) {\n        if (list == null || list.length == 0) {\n            throw new IllegalArgumentException(\"list must not be null or empty\");\n        }\n        int max = list[0];\n        for (int v : list) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe_new(String nums) {\n        try {\n            return Integer.parseInt(nums);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + nums);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_v2(int s, int value) {\n        if (value == 0) {\n            throw new IllegalArgumentException(\"value must not be zero\");\n        }\n        return (double) s / value;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseStringHelper(String value) {\n        if (value == null) {\n            return null;\n        }\n        return new StringBuilder(value).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int input, int nums) {\n        if (nums == 0) {\n            throw new IllegalArgumentException(\"nums must not be zero\");\n        }\n        return (double) input / nums;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime_new(int s) {\n        if (s < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= s; i++) {\n            if (s % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_v2(int[] value) {\n        if (value == null || value.length == 0) {\n            throw new IllegalArgumentException(\"value must not be null or empty\");\n        }\n        int max = value[0];\n        for (int v : value) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe_v2(String n) {\n        try {\n            return Integer.parseInt(n);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + n);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideHelper(int value, int text) {\n        if (text == 0) {\n            throw new IllegalArgumentException(\"text must not be zero\");\n        }\n        return (double) value / text;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_alt(int[] str) {\n        if (str == null || str.length == 0) {\n            throw new IllegalArgumentException(\"str must not be null or empty\");\n        }\n        int max = str[0];\n        for (int v : str) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_new(int[] value) {\n        if (value == null || value.length == 0) {\n            throw new IllegalArgumentException(\"value must not be null or empty\");\n        }\n        int max = value[0];\n        for (int v : value) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseStringEx(String n) {\n        if (n == null) {\n            return null;\n        }\n        return new StringBuilder(n).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_new(int str, int nums) {\n        if (nums == 0) {\n            throw new IllegalArgumentException(\"nums must not be zero\");\n        }\n        return (double) str / nums;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels_alt(String arr) {\n        if (arr == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : arr.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_v2(int[] arr) {\n        if (arr == null || arr.length == 0) {\n            throw new IllegalArgumentException(\"arr must not be null or empty\");\n        }\n        int max = arr[0];\n        for (int v : arr) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime(int n) {\n        if (n < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= n; i++) {\n            if (n % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_v2(List<Integer> text, List<Integer> arr) {\n        if (text == null || arr == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> text = new ArrayList<>(text.size() + arr.size());\n        int i = 0, j = 0;\n        while (i < text.size() && j < arr.size()) {\n            if (text.get(i) <= arr.get(j)) {\n                text.add(text.get(i++));\n            } else {\n                text.add(arr.get(j++));\n            }\n        }\n        while (i < text.size()) {\n            text.add(text.get(i++));\n        }\n        while (j < arr.size()) {\n            text.add(arr.get(j++));\n        }\n        return text;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafeHelper(String input) {\n        try {\n            return Integer.parseInt(input);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + input);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime_alt(int text) {\n        if (text < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= text; i++) {\n            if (text % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafeHelper(String n) {\n        try {\n            return Integer.parseInt(n);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + n);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime_v2(int s) {\n        if (s < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= s; i++) {\n            if (s % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseStringEx(String input) {\n        if (input == null) {\n            return null;\n        }\n        return new StringBuilder(input).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe_v2(String value) {\n        try {\n            return Integer.parseInt(value);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + value);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int s, int input) {\n        if (input == 0) {\n            throw new IllegalArgumentException(\"input must not be zero\");\n        }\n        return (double) s / input;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideEx(int text, int text) {\n        if (text == 0) {\n            throw new IllegalArgumentException(\"text must not be zero\");\n        }\n        return (double) text / text;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedHelper(List<Integer> str, List<Integer> arr) {\n        if (str == null || arr == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> arr = new ArrayList<>(str.size() + arr.size());\n        int i = 0, j = 0;\n        while (i < str.size() && j < arr.size()) {\n            if (str.get(i) <= arr.get(j)) {\n                arr.add(str.get(i++));\n            } else {\n                arr.add(arr.get(j++));\n            }\n        }\n        while (i < str.size()) {\n            arr.add(str.get(i++));\n        }\n        while (j < arr.size()) {\n            arr.add(arr.get(j++));\n        }\n        return arr;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int n, int list) {\n        if (list == 0) {\n            throw new IllegalArgumentException(\"list must not be zero\");\n        }\n        return (double) n / list;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideEx(int value, int value) {\n        if (value == 0) {\n            throw new IllegalArgumentException(\"value must not be zero\");\n        }\n        return (double) value / value;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideHelper(int n, int str) {\n        if (str == 0) {\n            throw new IllegalArgumentException(\"str must not be zero\");\n        }\n        return (double) n / str;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime_new(int list) {\n        if (list < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= list; i++) {\n            if (list % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_v2(List<Integer> input, List<Integer> s) {\n        if (input == null || s == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> text = new ArrayList<>(input.size() + s.size());\n        int i = 0, j = 0;\n        while (i < input.size() && j < s.size()) {\n            if (input.get(i) <= s.get(j)) {\n                text.add(input.get(i++));\n            } else {\n                text.add(s.get(j++));\n            }\n        }\n        while (i < input.size()) {\n            text.add(input.get(i++));\n        }\n        while (j < s.size()) {\n            text.add(s.get(j++));\n        }\n        return text;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime(int value) {\n        if (value < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= value; i++) {\n            if (value % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideEx(int text, int input) {\n        if (input == 0) {\n            throw new IllegalArgumentException(\"input must not be zero\");\n        }\n        return (double) text / input;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseStringHelper(String text) {\n        if (text == null) {\n            return null;\n        }\n        return new StringBuilder(text).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int maxEx(int[] input) {\n        if (input == null || input.length == 0) {\n            throw new IllegalArgumentException(\"input must not be null or empty\");\n        }\n        int max = input[0];\n        for (int v : input) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max(int[] list) {\n        if (list == null || list.length == 0) {\n            throw new IllegalArgumentException(\"list must not be null or empty\");\n        }\n        int max = list[0];\n        for (int v : list) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime(int arr) {\n        if (arr < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= arr; i++) {\n            if (arr % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe_alt(String str) {\n        try {\n            return Integer.parseInt(str);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + str);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_v2(int[] input) {\n        if (input == null || input.length == 0) {\n            throw new IllegalArgumentException(\"input must not be null or empty\");\n        }\n        int max = input[0];\n        for (int v : input) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseStringEx(String nums) {\n        if (nums == null) {\n            return null;\n        }\n        return new StringBuilder(nums).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe_v2(String str) {\n        try {\n            return Integer.parseInt(str);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + str);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> nums, List<Integer> arr) {\n        if (nums == null || arr == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> list = new ArrayList<>(nums.size() + arr.size());\n        int i = 0, j = 0;\n        while (i < nums.size() && j < arr.size()) {\n            if (nums.get(i) <= arr.get(j)) {\n                list.add(nums.get(i++));\n            } else {\n                list.add(arr.get(j++));\n            }\n        }\n        while (i < nums.size()) {\n            list.add(nums.get(i++));\n        }\n        while (j < arr.size()) {\n            list.add(arr.get(j++));\n        }\n        return list;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrimeEx(int str) {\n        if (str < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= str; i++) {\n            if (str % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe_alt(String list) {\n        try {\n            return Integer.parseInt(list);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + list);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> list, List<Integer> list) {\n        if (list == null || list == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> text = new ArrayList<>(list.size() + list.size());\n        int i = 0, j = 0;\n        while (i < list.size() && j < list.size()) {\n            if (list.get(i) <= list.get(j)) {\n                text.add(list.get(i++));\n            } else {\n                text.add(list.get(j++));\n            }\n        }\n        while (i < list.size()) {\n            text.add(list.get(i++));\n        }\n        while (j < list.size()) {\n            text.add(list.get(j++));\n        }\n        return text;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime(int nums) {\n        if (nums < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= nums; i++) {\n            if (nums % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int maxEx(int[] s) {\n        if (s == null || s.length == 0) {\n            throw new IllegalArgumentException(\"s must not be null or empty\");\n        }\n        int max = s[0];\n        for (int v : s) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_v2(int[] n) {\n        if (n == null || n.length == 0) {\n            throw new IllegalArgumentException(\"n must not be null or empty\");\n        }\n        int max = n[0];\n        for (int v : n) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime_new(int text) {\n        if (text < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= text; i++) {\n            if (text % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int str, int nums) {\n        if (nums == 0) {\n            throw new IllegalArgumentException(\"nums must not be zero\");\n        }\n        return (double) str / nums;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString_v2(String arr) {\n        if (arr == null) {\n            return null;\n        }\n        return new StringBuilder(arr).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int value, int value) {\n        if (value == 0) {\n            throw new IllegalArgumentException(\"value must not be zero\");\n        }\n        return (double) value / value;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_v2(int[] text) {\n        if (text == null || text.length == 0) {\n            throw new IllegalArgumentException(\"text must not be null or empty\");\n        }\n        int max = text[0];\n        for (int v : text) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedEx(List<Integer> nums, List<Integer> text) {\n        if (nums == null || text == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> nums = new ArrayList<>(nums.size() + text.size());\n        int i = 0, j = 0;\n        while (i < nums.size() && j < text.size()) {\n            if (nums.get(i) <= text.get(j)) {\n                nums.add(nums.get(i++));\n            } else {\n                nums.add(text.get(j++));\n            }\n        }\n        while (i < nums.size()) {\n            nums.add(nums.get(i++));\n        }\n        while (j < text.size()) {\n            nums.add(text.get(j++));\n        }\n        return nums;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime_alt(int input) {\n        if (input < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= input; i++) {\n            if (input % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedHelper(List<Integer> list, List<Integer> text) {\n        if (list == null || text == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> s = new ArrayList<>(list.size() + text.size());\n        int i = 0, j = 0;\n        while (i < list.size() && j < text.size()) {\n            if (list.get(i) <= text.get(j)) {\n                s.add(list.get(i++));\n            } else {\n                s.add(text.get(j++));\n            }\n        }\n        while (i < list.size()) {\n            s.add(list.get(i++));\n        }\n        while (j < text.size()) {\n            s.add(text.get(j++));\n        }\n        return s;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowelsEx(String s) {\n        if (s == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : s.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels(String s) {\n        if (s == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : s.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels_new(String text) {\n        if (text == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : text.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime_new(int arr) {\n        if (arr < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= arr; i++) {\n            if (arr % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max(int[] nums) {\n        if (nums == null || nums.length == 0) {\n            throw new IllegalArgumentException(\"nums must not be null or empty\");\n        }\n        int max = nums[0];\n        for (int v : nums) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime_v2(int list) {\n        if (list < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= list; i++) {\n            if (list % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe_v2(String arr) {\n        try {\n            return Integer.parseInt(arr);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + arr);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe_alt(String s) {\n        try {\n            return Integer.parseInt(s);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + s);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe_alt(String n) {\n        try {\n            return Integer.parseInt(n);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + n);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_new(List<Integer> nums, List<Integer> n) {\n        if (nums == null || n == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> arr = new ArrayList<>(nums.size() + n.size());\n        int i = 0, j = 0;\n        while (i < nums.size() && j < n.size()) {\n            if (nums.get(i) <= n.get(j)) {\n                arr.add(nums.get(i++));\n            } else {\n                arr.add(n.get(j++));\n            }\n        }\n        while (i < nums.size()) {\n            arr.add(nums.get(i++));\n        }\n        while (j < n.size()) {\n            arr.add(n.get(j++));\n        }\n        return arr;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideEx(int input, int nums) {\n        if (nums == 0) {\n            throw new IllegalArgumentException(\"nums must not be zero\");\n        }\n        return (double) input / nums;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_new(int[] nums) {\n        if (nums == null || nums.length == 0) {\n            throw new IllegalArgumentException(\"nums must not be null or empty\");\n        }\n        int max = nums[0];\n        for (int v : nums) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseStringEx(String s) {\n        if (s == null) {\n            return null;\n        }\n        return new StringBuilder(s).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowelsEx(String input) {\n        if (input == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : input.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int list, int list) {\n        if (list == 0) {\n            throw new IllegalArgumentException(\"list must not be zero\");\n        }\n        return (double) list / list;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe_new(String arr) {\n        try {\n            return Integer.parseInt(arr);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + arr);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedEx(List<Integer> value, List<Integer> text) {\n        if (value == null || text == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> list = new ArrayList<>(value.size() + text.size());\n        int i = 0, j = 0;\n        while (i < value.size() && j < text.size()) {\n            if (value.get(i) <= text.get(j)) {\n                list.add(value.get(i++));\n            } else {\n                list.add(text.get(j++));\n            }\n        }\n        while (i < value.size()) {\n            list.add(value.get(i++));\n        }\n        while (j < text.size()) {\n            list.add(text.get(j++));\n        }\n        return list;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideHelper(int n, int s) {\n        if (s == 0) {\n            throw new IllegalArgumentException(\"s must not be zero\");\n        }\n        return (double) n / s;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedEx(List<Integer> value, List<Integer> text) {\n        if (value == null || text == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> arr = new ArrayList<>(value.size() + text.size());\n        int i = 0, j = 0;\n        while (i < value.size() && j < text.size()) {\n            if (value.get(i) <= text.get(j)) {\n                arr.add(value.get(i++));\n            } else {\n                arr.add(text.get(j++));\n            }\n        }\n        while (i < value.size()) {\n            arr.add(value.get(i++));\n        }\n        while (j < text.size()) {\n            arr.add(text.get(j++));\n        }\n        return arr;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime_alt(int s) {\n        if (s < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= s; i++) {\n            if (s % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedHelper(List<Integer> arr, List<Integer> n) {\n        if (arr == null || n == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> list = new ArrayList<>(arr.size() + n.size());\n        int i = 0, j = 0;\n        while (i < arr.size() && j < n.size()) {\n            if (arr.get(i) <= n.get(j)) {\n                list.add(arr.get(i++));\n            } else {\n                list.add(n.get(j++));\n            }\n        }\n        while (i < arr.size()) {\n            list.add(arr.get(i++));\n        }\n        while (j < n.size()) {\n            list.add(n.get(j++));\n        }\n        return list;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_new(List<Integer> nums, List<Integer> str) {\n        if (nums == null || str == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> input = new ArrayList<>(nums.size() + str.size());\n        int i = 0, j = 0;\n        while (i < nums.size() && j < str.size()) {\n            if (nums.get(i) <= str.get(j)) {\n                input.add(nums.get(i++));\n            } else {\n                input.add(str.get(j++));\n            }\n        }\n        while (i < nums.size()) {\n            input.add(nums.get(i++));\n        }\n        while (j < str.size()) {\n            input.add(str.get(j++));\n        }\n        return input;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe_v2(String input) {\n        try {\n            return Integer.parseInt(input);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + input);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString_alt(String list) {\n        if (list == null) {\n            return null;\n        }\n        return new StringBuilder(list).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_new(int text, int nums) {\n        if (nums == 0) {\n            throw new IllegalArgumentException(\"nums must not be zero\");\n        }\n        return (double) text / nums;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime(int input) {\n        if (input < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= input; i++) {\n            if (input % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedEx(List<Integer> input, List<Integer> input) {\n        if (input == null || input == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> nums = new ArrayList<>(input.size() + input.size());\n        int i = 0, j = 0;\n        while (i < input.size() && j < input.size()) {\n            if (input.get(i) <= input.get(j)) {\n                nums.add(input.get(i++));\n            } else {\n                nums.add(input.get(j++));\n            }\n        }\n        while (i < input.size()) {\n            nums.add(input.get(i++));\n        }\n        while (j < input.size()) {\n            nums.add(input.get(j++));\n        }\n        return nums;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> input, List<Integer> nums) {\n        if (input == null || nums == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> text = new ArrayList<>(input.size() + nums.size());\n        int i = 0, j = 0;\n        while (i < input.size() && j < nums.size()) {\n            if (input.get(i) <= nums.get(j)) {\n                text.add(input.get(i++));\n            } else {\n                text.add(nums.get(j++));\n            }\n        }\n        while (i < input.size()) {\n            text.add(input.get(i++));\n        }\n        while (j < nums.size()) {\n            text.add(nums.get(j++));\n        }\n        return text;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowelsHelper(String list) {\n        if (list == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : list.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime_v2(int n) {\n        if (n < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= n; i++) {\n            if (n % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideHelper(int s, int list) {\n        if (list == 0) {\n            throw new IllegalArgumentException(\"list must not be zero\");\n        }\n        return (double) s / list;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe(String s) {\n        try {\n            return Integer.parseInt(s);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + s);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime_v2(int nums) {\n        if (nums < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= nums; i++) {\n            if (nums % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedHelper(List<Integer> list, List<Integer> n) {\n        if (list == null || n == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> arr = new ArrayList<>(list.size() + n.size());\n        int i = 0, j = 0;\n        while (i < list.size() && j < n.size()) {\n            if (list.get(i) <= n.get(j)) {\n                arr.add(list.get(i++));\n            } else {\n                arr.add(n.get(j++));\n            }\n        }\n        while (i < list.size()) {\n            arr.add(list.get(i++));\n        }\n        while (j < n.size()) {\n            arr.add(n.get(j++));\n        }\n        return arr;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideEx(int nums, int text) {\n        if (text == 0) {\n            throw new IllegalArgumentException(\"text must not be zero\");\n        }\n        return (double) nums / text;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedEx(List<Integer> n, List<Integer> arr) {\n        if (n == null || arr == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> input = new ArrayList<>(n.size() + arr.size());\n        int i = 0, j = 0;\n        while (i < n.size() && j < arr.size()) {\n            if (n.get(i) <= arr.get(j)) {\n                input.add(n.get(i++));\n            } else {\n                input.add(arr.get(j++));\n            }\n        }\n        while (i < n.size()) {\n            input.add(n.get(i++));\n        }\n        while (j < arr.size()) {\n            input.add(arr.get(j++));\n        }\n        return input;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString_alt(String input) {\n        if (input == null) {\n            return null;\n        }\n        return new StringBuilder(input).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_new(int text, int str) {\n        if (str == 0) {\n            throw new IllegalArgumentException(\"str must not be zero\");\n        }\n        return (double) text / str;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int maxHelper(int[] str) {\n        if (str == null || str.length == 0) {\n            throw new IllegalArgumentException(\"str must not be null or empty\");\n        }\n        int max = str[0];\n        for (int v : str) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseStringEx(String arr) {\n        if (arr == null) {\n            return null;\n        }\n        return new StringBuilder(arr).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowelsEx(String value) {\n        if (value == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : value.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafeEx(String nums) {\n        try {\n            return Integer.parseInt(nums);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + nums);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_v2(int str, int str) {\n        if (str == 0) {\n            throw new IllegalArgumentException(\"str must not be zero\");\n        }\n        return (double) str / str;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString_alt(String arr) {\n        if (arr == null) {\n            return null;\n        }\n        return new StringBuilder(arr).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedHelper(List<Integer> input, List<Integer> nums) {\n        if (input == null || nums == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> str = new ArrayList<>(input.size() + nums.size());\n        int i = 0, j = 0;\n        while (i < input.size() && j < nums.size()) {\n            if (input.get(i) <= nums.get(j)) {\n                str.add(input.get(i++));\n            } else {\n                str.add(nums.get(j++));\n            }\n        }\n        while (i < input.size()) {\n            str.add(input.get(i++));\n        }\n        while (j < nums.size()) {\n            str.add(nums.get(j++));\n        }\n        return str;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe(String n) {\n        try {\n            return Integer.parseInt(n);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + n);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe_new(String str) {\n        try {\n            return Integer.parseInt(str);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + str);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels_new(String s) {\n        if (s == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : s.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int maxEx(int[] arr) {\n        if (arr == null || arr.length == 0) {\n            throw new IllegalArgumentException(\"arr must not be null or empty\");\n        }\n        int max = arr[0];\n        for (int v : arr) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> n, List<Integer> n) {\n        if (n == null || n == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> s = new ArrayList<>(n.size() + n.size());\n        int i = 0, j = 0;\n        while (i < n.size() && j < n.size()) {\n            if (n.get(i) <= n.get(j)) {\n                s.add(n.get(i++));\n            } else {\n                s.add(n.get(j++));\n            }\n        }\n        while (i < n.size()) {\n            s.add(n.get(i++));\n        }\n        while (j < n.size()) {\n            s.add(n.get(j++));\n        }\n        return s;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseStringHelper(String str) {\n        if (str == null) {\n            return null;\n        }\n        return new StringBuilder(str).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedEx(List<Integer> n, List<Integer> nums) {\n        if (n == null || nums == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> value = new ArrayList<>(n.size() + nums.size());\n        int i = 0, j = 0;\n        while (i < n.size() && j < nums.size()) {\n            if (n.get(i) <= nums.get(j)) {\n                value.add(n.get(i++));\n            } else {\n                value.add(nums.get(j++));\n            }\n        }\n        while (i < n.size()) {\n            value.add(n.get(i++));\n        }\n        while (j < nums.size()) {\n            value.add(nums.get(j++));\n        }\n        return value;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_new(List<Integer> s, List<Integer> arr) {\n        if (s == null || arr == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> s = new ArrayList<>(s.size() + arr.size());\n        int i = 0, j = 0;\n        while (i < s.size() && j < arr.size()) {\n            if (s.get(i) <= arr.get(j)) {\n                s.add(s.get(i++));\n            } else {\n                s.add(arr.get(j++));\n            }\n        }\n        while (i < s.size()) {\n            s.add(s.get(i++));\n        }\n        while (j < arr.size()) {\n            s.add(arr.get(j++));\n        }\n        return s;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_new(int nums, int list) {\n        if (list == 0) {\n            throw new IllegalArgumentException(\"list must not be zero\");\n        }\n        return (double) nums / list;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int maxEx(int[] str) {\n        if (str == null || str.length == 0) {\n            throw new IllegalArgumentException(\"str must not be null or empty\");\n        }\n        int max = str[0];\n        for (int v : str) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> list, List<Integer> s) {\n        if (list == null || s == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> value = new ArrayList<>(list.size() + s.size());\n        int i = 0, j = 0;\n        while (i < list.size() && j < s.size()) {\n            if (list.get(i) <= s.get(j)) {\n                value.add(list.get(i++));\n            } else {\n                value.add(s.get(j++));\n            }\n        }\n        while (i < list.size()) {\n            value.add(list.get(i++));\n        }\n        while (j < s.size()) {\n            value.add(s.get(j++));\n        }\n        return value;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int n, int n) {\n        if (n == 0) {\n            throw new IllegalArgumentException(\"n must not be zero\");\n        }\n        return (double) n / n;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_new(int arr, int n) {\n        if (n == 0) {\n            throw new IllegalArgumentException(\"n must not be zero\");\n        }\n        return (double) arr / n;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString(String n) {\n        if (n == null) {\n            return null;\n        }\n        return new StringBuilder(n).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafeHelper(String str) {\n        try {\n            return Integer.parseInt(str);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + str);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_new(int[] input) {\n        if (input == null || input.length == 0) {\n            throw new IllegalArgumentException(\"input must not be null or empty\");\n        }\n        int max = input[0];\n        for (int v : input) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels_alt(String text) {\n        if (text == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : text.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int arr, int s) {\n        if (s == 0) {\n            throw new IllegalArgumentException(\"s must not be zero\");\n        }\n        return (double) arr / s;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime_new(int n) {\n        if (n < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= n; i++) {\n            if (n % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_alt(int[] n) {\n        if (n == null || n.length == 0) {\n            throw new IllegalArgumentException(\"n must not be null or empty\");\n        }\n        int max = n[0];\n        for (int v : n) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max(int[] arr) {\n        if (arr == null || arr.length == 0) {\n            throw new IllegalArgumentException(\"arr must not be null or empty\");\n        }\n        int max = arr[0];\n        for (int v : arr) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString_new(String nums) {\n        if (nums == null) {\n            return null;\n        }\n        return new StringBuilder(nums).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideHelper(int value, int list) {\n        if (list == 0) {\n            throw new IllegalArgumentException(\"list must not be zero\");\n        }\n        return (double) value / list;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int nums, int str) {\n        if (str == 0) {\n            throw new IllegalArgumentException(\"str must not be zero\");\n        }\n        return (double) nums / str;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe_alt(String nums) {\n        try {\n            return Integer.parseInt(nums);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + nums);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max(int[] input) {\n        if (input == null || input.length == 0) {\n            throw new IllegalArgumentException(\"input must not be null or empty\");\n        }\n        int max = input[0];\n        for (int v : input) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseStringHelper(String input) {\n        if (input == null) {\n            return null;\n        }\n        return new StringBuilder(input).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedHelper(List<Integer> n, List<Integer> value) {\n        if (n == null || value == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> input = new ArrayList<>(n.size() + value.size());\n        int i = 0, j = 0;\n        while (i < n.size() && j < value.size()) {\n            if (n.get(i) <= value.get(j)) {\n                input.add(n.get(i++));\n            } else {\n                input.add(value.get(j++));\n            }\n        }\n        while (i < n.size()) {\n            input.add(n.get(i++));\n        }\n        while (j < value.size()) {\n            input.add(value.get(j++));\n        }\n        return input;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int s, int list) {\n        if (list == 0) {\n            throw new IllegalArgumentException(\"list must not be zero\");\n        }\n        return (double) s / list;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString_new(String list) {\n        if (list == null) {\n            return null;\n        }\n        return new StringBuilder(list).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideEx(int str, int nums) {\n        if (nums == 0) {\n            throw new IllegalArgumentException(\"nums must not be zero\");\n        }\n        return (double) str / nums;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideEx(int nums, int n) {\n        if (n == 0) {\n            throw new IllegalArgumentException(\"n must not be zero\");\n        }\n        return (double) nums / n;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseStringEx(String str) {\n        if (str == null) {\n            return null;\n        }\n        return new StringBuilder(str).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> text, List<Integer> text) {\n        if (text == null || text == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> str = new ArrayList<>(text.size() + text.size());\n        int i = 0, j = 0;\n        while (i < text.size() && j < text.size()) {\n            if (text.get(i) <= text.get(j)) {\n                str.add(text.get(i++));\n            } else {\n                str.add(text.get(j++));\n            }\n        }\n        while (i < text.size()) {\n            str.add(text.get(i++));\n        }\n        while (j < text.size()) {\n            str.add(text.get(j++));\n        }\n        return str;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowelsHelper(String arr) {\n        if (arr == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : arr.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideHelper(int n, int input) {\n        if (input == 0) {\n            throw new IllegalArgumentException(\"input must not be zero\");\n        }\n        return (double) n / input;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> text, List<Integer> s) {\n        if (text == null || s == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> list = new ArrayList<>(text.size() + s.size());\n        int i = 0, j = 0;\n        while (i < text.size() && j < s.size()) {\n            if (text.get(i) <= s.get(j)) {\n                list.add(text.get(i++));\n            } else {\n                list.add(s.get(j++));\n            }\n        }\n        while (i < text.size()) {\n            list.add(text.get(i++));\n        }\n        while (j < s.size()) {\n            list.add(s.get(j++));\n        }\n        return list;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrimeEx(int nums) {\n        if (nums < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= nums; i++) {\n            if (nums % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> text, List<Integer> s) {\n        if (text == null || s == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> arr = new ArrayList<>(text.size() + s.size());\n        int i = 0, j = 0;\n        while (i < text.size() && j < s.size()) {\n            if (text.get(i) <= s.get(j)) {\n                arr.add(text.get(i++));\n            } else {\n                arr.add(s.get(j++));\n            }\n        }\n        while (i < text.size()) {\n            arr.add(text.get(i++));\n        }\n        while (j < s.size()) {\n            arr.add(s.get(j++));\n        }\n        return arr;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> n, List<Integer> n) {\n        if (n == null || n == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> nums = new ArrayList<>(n.size() + n.size());\n        int i = 0, j = 0;\n        while (i < n.size() && j < n.size()) {\n            if (n.get(i) <= n.get(j)) {\n                nums.add(n.get(i++));\n            } else {\n                nums.add(n.get(j++));\n            }\n        }\n        while (i < n.size()) {\n            nums.add(n.get(i++));\n        }\n        while (j < n.size()) {\n            nums.add(n.get(j++));\n        }\n        return nums;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels_new(String n) {\n        if (n == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : n.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString_v2(String nums) {\n        if (nums == null) {\n            return null;\n        }\n        return new StringBuilder(nums).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe(String value) {\n        try {\n            return Integer.parseInt(value);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + value);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> arr, List<Integer> nums) {\n        if (arr == null || nums == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> list = new ArrayList<>(arr.size() + nums.size());\n        int i = 0, j = 0;\n        while (i < arr.size() && j < nums.size()) {\n            if (arr.get(i) <= nums.get(j)) {\n                list.add(arr.get(i++));\n            } else {\n                list.add(nums.get(j++));\n            }\n        }\n        while (i < arr.size()) {\n            list.add(arr.get(i++));\n        }\n        while (j < nums.size()) {\n            list.add(nums.get(j++));\n        }\n        return list;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int nums, int list) {\n        if (list == 0) {\n            throw new IllegalArgumentException(\"list must not be zero\");\n        }\n        return (double) nums / list;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_alt(int[] value) {\n        if (value == null || value.length == 0) {\n            throw new IllegalArgumentException(\"value must not be null or empty\");\n        }\n        int max = value[0];\n        for (int v : value) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int n, int value) {\n        if (value == 0) {\n            throw new IllegalArgumentException(\"value must not be zero\");\n        }\n        return (double) n / value;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> text, List<Integer> value) {\n        if (text == null || value == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> input = new ArrayList<>(text.size() + value.size());\n        int i = 0, j = 0;\n        while (i < text.size() && j < value.size()) {\n            if (text.get(i) <= value.get(j)) {\n                input.add(text.get(i++));\n            } else {\n                input.add(value.get(j++));\n            }\n        }\n        while (i < text.size()) {\n            input.add(text.get(i++));\n        }\n        while (j < value.size()) {\n            input.add(value.get(j++));\n        }\n        return input;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels(String arr) {\n        if (arr == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : arr.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_v2(int arr, int input) {\n        if (input == 0) {\n            throw new IllegalArgumentException(\"input must not be zero\");\n        }\n        return (double) arr / input;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedEx(List<Integer> n, List<Integer> nums) {\n        if (n == null || nums == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> nums = new ArrayList<>(n.size() + nums.size());\n        int i = 0, j = 0;\n        while (i < n.size() && j < nums.size()) {\n            if (n.get(i) <= nums.get(j)) {\n                nums.add(n.get(i++));\n            } else {\n                nums.add(nums.get(j++));\n            }\n        }\n        while (i < n.size()) {\n            nums.add(n.get(i++));\n        }\n        while (j < nums.size()) {\n            nums.add(nums.get(j++));\n        }\n        return nums;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafeEx(String n) {\n        try {\n            return Integer.parseInt(n);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + n);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrimeHelper(int text) {\n        if (text < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= text; i++) {\n            if (text % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString_alt(String nums) {\n        if (nums == null) {\n            return null;\n        }\n        return new StringBuilder(nums).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime_alt(int nums) {\n        if (nums < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= nums; i++) {\n            if (nums % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe_alt(String arr) {\n        try {\n            return Integer.parseInt(arr);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + arr);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int maxHelper(int[] n) {\n        if (n == null || n.length == 0) {\n            throw new IllegalArgumentException(\"n must not be null or empty\");\n        }\n        int max = n[0];\n        for (int v : n) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime_alt(int value) {\n        if (value < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= value; i++) {\n            if (value % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrimeEx(int input) {\n        if (input < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= input; i++) {\n            if (input % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafeEx(String value) {\n        try {\n            return Integer.parseInt(value);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + value);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_v2(int value, int arr) {\n        if (arr == 0) {\n            throw new IllegalArgumentException(\"arr must not be zero\");\n        }\n        return (double) value / arr;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe_v2(String s) {\n        try {\n            return Integer.parseInt(s);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + s);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_new(int[] n) {\n        if (n == null || n.length == 0) {\n            throw new IllegalArgumentException(\"n must not be null or empty\");\n        }\n        int max = n[0];\n        for (int v : n) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> arr, List<Integer> text) {\n        if (arr == null || text == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> input = new ArrayList<>(arr.size() + text.size());\n        int i = 0, j = 0;\n        while (i < arr.size() && j < text.size()) {\n            if (arr.get(i) <= text.get(j)) {\n                input.add(arr.get(i++));\n            } else {\n                input.add(text.get(j++));\n            }\n        }\n        while (i < arr.size()) {\n            input.add(arr.get(i++));\n        }\n        while (j < text.size()) {\n            input.add(text.get(j++));\n        }\n        return input;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int n, int nums) {\n        if (nums == 0) {\n            throw new IllegalArgumentException(\"nums must not be zero\");\n        }\n        return (double) n / nums;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString(String arr) {\n        if (arr == null) {\n            return null;\n        }\n        return new StringBuilder(arr).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString_v2(String input) {\n        if (input == null) {\n            return null;\n        }\n        return new StringBuilder(input).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString_new(String input) {\n        if (input == null) {\n            return null;\n        }\n        return new StringBuilder(input).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedHelper(List<Integer> input, List<Integer> text) {\n        if (input == null || text == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> str = new ArrayList<>(input.size() + text.size());\n        int i = 0, j = 0;\n        while (i < input.size() && j < text.size()) {\n            if (input.get(i) <= text.get(j)) {\n                str.add(input.get(i++));\n            } else {\n                str.add(text.get(j++));\n            }\n        }\n        while (i < input.size()) {\n            str.add(input.get(i++));\n        }\n        while (j < text.size()) {\n            str.add(text.get(j++));\n        }\n        return str;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString(String str) {\n        if (str == null) {\n            return null;\n        }\n        return new StringBuilder(str).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime_alt(int n) {\n        if (n < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= n; i++) {\n            if (n % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideHelper(int str, int n) {\n        if (n == 0) {\n            throw new IllegalArgumentException(\"n must not be zero\");\n        }\n        return (double) str / n;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide(int list, int text) {\n        if (text == 0) {\n            throw new IllegalArgumentException(\"text must not be zero\");\n        }\n        return (double) list / text;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideHelper(int input, int n) {\n        if (n == 0) {\n            throw new IllegalArgumentException(\"n must not be zero\");\n        }\n        return (double) input / n;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrimeHelper(int n) {\n        if (n < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= n; i++) {\n            if (n % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int text, int str) {\n        if (str == 0) {\n            throw new IllegalArgumentException(\"str must not be zero\");\n        }\n        return (double) text / str;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafeHelper(String list) {\n        try {\n            return Integer.parseInt(list);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + list);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide(int text, int str) {\n        if (str == 0) {\n            throw new IllegalArgumentException(\"str must not be zero\");\n        }\n        return (double) text / str;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> list, List<Integer> text) {\n        if (list == null || text == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> list = new ArrayList<>(list.size() + text.size());\n        int i = 0, j = 0;\n        while (i < list.size() && j < text.size()) {\n            if (list.get(i) <= text.get(j)) {\n                list.add(list.get(i++));\n            } else {\n                list.add(text.get(j++));\n            }\n        }\n        while (i < list.size()) {\n            list.add(list.get(i++));\n        }\n        while (j < text.size()) {\n            list.add(text.get(j++));\n        }\n        return list;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max(int[] text) {\n        if (text == null || text.length == 0) {\n            throw new IllegalArgumentException(\"text must not be null or empty\");\n        }\n        int max = text[0];\n        for (int v : text) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe_new(String value) {\n        try {\n            return Integer.parseInt(value);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + value);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> arr, List<Integer> list) {\n        if (arr == null || list == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> str = new ArrayList<>(arr.size() + list.size());\n        int i = 0, j = 0;\n        while (i < arr.size() && j < list.size()) {\n            if (arr.get(i) <= list.get(j)) {\n                str.add(arr.get(i++));\n            } else {\n                str.add(list.get(j++));\n            }\n        }\n        while (i < arr.size()) {\n            str.add(arr.get(i++));\n        }\n        while (j < list.size()) {\n            str.add(list.get(j++));\n        }\n        return str;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels_alt(String n) {\n        if (n == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : n.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrimeEx(int value) {\n        if (value < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= value; i++) {\n            if (value % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrimeHelper(int list) {\n        if (list < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= list; i++) {\n            if (list % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int maxEx(int[] nums) {\n        if (nums == null || nums.length == 0) {\n            throw new IllegalArgumentException(\"nums must not be null or empty\");\n        }\n        int max = nums[0];\n        for (int v : nums) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_v2(List<Integer> arr, List<Integer> str) {\n        if (arr == null || str == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> input = new ArrayList<>(arr.size() + str.size());\n        int i = 0, j = 0;\n        while (i < arr.size() && j < str.size()) {\n            if (arr.get(i) <= str.get(j)) {\n                input.add(arr.get(i++));\n            } else {\n                input.add(str.get(j++));\n            }\n        }\n        while (i < arr.size()) {\n            input.add(arr.get(i++));\n        }\n        while (j < str.size()) {\n            input.add(str.get(j++));\n        }\n        return input;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_v2(List<Integer> list, List<Integer> nums) {\n        if (list == null || nums == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> s = new ArrayList<>(list.size() + nums.size());\n        int i = 0, j = 0;\n        while (i < list.size() && j < nums.size()) {\n            if (list.get(i) <= nums.get(j)) {\n                s.add(list.get(i++));\n            } else {\n                s.add(nums.get(j++));\n            }\n        }\n        while (i < list.size()) {\n            s.add(list.get(i++));\n        }\n        while (j < nums.size()) {\n            s.add(nums.get(j++));\n        }\n        return s;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> arr, List<Integer> value) {\n        if (arr == null || value == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> value = new ArrayList<>(arr.size() + value.size());\n        int i = 0, j = 0;\n        while (i < arr.size() && j < value.size()) {\n            if (arr.get(i) <= value.get(j)) {\n                value.add(arr.get(i++));\n            } else {\n                value.add(value.get(j++));\n            }\n        }\n        while (i < arr.size()) {\n            value.add(arr.get(i++));\n        }\n        while (j < value.size()) {\n            value.add(value.get(j++));\n        }\n        return value;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> n, List<Integer> str) {\n        if (n == null || str == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> str = new ArrayList<>(n.size() + str.size());\n        int i = 0, j = 0;\n        while (i < n.size() && j < str.size()) {\n            if (n.get(i) <= str.get(j)) {\n                str.add(n.get(i++));\n            } else {\n                str.add(str.get(j++));\n            }\n        }\n        while (i < n.size()) {\n            str.add(n.get(i++));\n        }\n        while (j < str.size()) {\n            str.add(str.get(j++));\n        }\n        return str;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_v2(int arr, int str) {\n        if (str == 0) {\n            throw new IllegalArgumentException(\"str must not be zero\");\n        }\n        return (double) arr / str;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString(String s) {\n        if (s == null) {\n            return null;\n        }\n        return new StringBuilder(s).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowelsHelper(String nums) {\n        if (nums == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : nums.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime_new(int nums) {\n        if (nums < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= nums; i++) {\n            if (nums % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_new(int n, int value) {\n        if (value == 0) {\n            throw new IllegalArgumentException(\"value must not be zero\");\n        }\n        return (double) n / value;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedEx(List<Integer> s, List<Integer> list) {\n        if (s == null || list == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> text = new ArrayList<>(s.size() + list.size());\n        int i = 0, j = 0;\n        while (i < s.size() && j < list.size()) {\n            if (s.get(i) <= list.get(j)) {\n                text.add(s.get(i++));\n            } else {\n                text.add(list.get(j++));\n            }\n        }\n        while (i < s.size()) {\n            text.add(s.get(i++));\n        }\n        while (j < list.size()) {\n            text.add(list.get(j++));\n        }\n        return text;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime_v2(int str) {\n        if (str < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= str; i++) {\n            if (str % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_alt(int[] text) {\n        if (text == null || text.length == 0) {\n            throw new IllegalArgumentException(\"text must not be null or empty\");\n        }\n        int max = text[0];\n        for (int v : text) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_v2(int n, int value) {\n        if (value == 0) {\n            throw new IllegalArgumentException(\"value must not be zero\");\n        }\n        return (double) n / value;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString_new(String n) {\n        if (n == null) {\n            return null;\n        }\n        return new StringBuilder(n).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime(int list) {\n        if (list < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= list; i++) {\n            if (list % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrimeEx(int s) {\n        if (s < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= s; i++) {\n            if (s % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide(int arr, int n) {\n        if (n == 0) {\n            throw new IllegalArgumentException(\"n must not be zero\");\n        }\n        return (double) arr / n;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedHelper(List<Integer> str, List<Integer> value) {\n        if (str == null || value == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> s = new ArrayList<>(str.size() + value.size());\n        int i = 0, j = 0;\n        while (i < str.size() && j < value.size()) {\n            if (str.get(i) <= value.get(j)) {\n                s.add(str.get(i++));\n            } else {\n                s.add(value.get(j++));\n            }\n        }\n        while (i < str.size()) {\n            s.add(str.get(i++));\n        }\n        while (j < value.size()) {\n            s.add(value.get(j++));\n        }\n        return s;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedHelper(List<Integer> str, List<Integer> str) {\n        if (str == null || str == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> str = new ArrayList<>(str.size() + str.size());\n        int i = 0, j = 0;\n        while (i < str.size() && j < str.size()) {\n            if (str.get(i) <= str.get(j)) {\n                str.add(str.get(i++));\n            } else {\n                str.add(str.get(j++));\n            }\n        }\n        while (i < str.size()) {\n            str.add(str.get(i++));\n        }\n        while (j < str.size()) {\n            str.add(str.get(j++));\n        }\n        return str;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideEx(int text, int arr) {\n        if (arr == 0) {\n            throw new IllegalArgumentException(\"arr must not be zero\");\n        }\n        return (double) text / arr;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int maxHelper(int[] text) {\n        if (text == null || text.length == 0) {\n            throw new IllegalArgumentException(\"text must not be null or empty\");\n        }\n        int max = text[0];\n        for (int v : text) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels(String text) {\n        if (text == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : text.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafeHelper(String nums) {\n        try {\n            return Integer.parseInt(nums);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + nums);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrimeEx(int arr) {\n        if (arr < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= arr; i++) {\n            if (arr % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString_v2(String value) {\n        if (value == null) {\n            return null;\n        }\n        return new StringBuilder(value).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideEx(int n, int nums) {\n        if (nums == 0) {\n            throw new IllegalArgumentException(\"nums must not be zero\");\n        }\n        return (double) n / nums;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels_alt(String nums) {\n        if (nums == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : nums.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe(String str) {\n        try {\n            return Integer.parseInt(str);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + str);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_new(int[] str) {\n        if (str == null || str.length == 0) {\n            throw new IllegalArgumentException(\"str must not be null or empty\");\n        }\n        int max = str[0];\n        for (int v : str) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafeHelper(String arr) {\n        try {\n            return Integer.parseInt(arr);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + arr);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_alt(int[] list) {\n        if (list == null || list.length == 0) {\n            throw new IllegalArgumentException(\"list must not be null or empty\");\n        }\n        int max = list[0];\n        for (int v : list) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_new(int value, int nums) {\n        if (nums == 0) {\n            throw new IllegalArgumentException(\"nums must not be zero\");\n        }\n        return (double) value / nums;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideEx(int str, int input) {\n        if (input == 0) {\n            throw new IllegalArgumentException(\"input must not be zero\");\n        }\n        return (double) str / input;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> list, List<Integer> s) {\n        if (list == null || s == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> text = new ArrayList<>(list.size() + s.size());\n        int i = 0, j = 0;\n        while (i < list.size() && j < s.size()) {\n            if (list.get(i) <= s.get(j)) {\n                text.add(list.get(i++));\n            } else {\n                text.add(s.get(j++));\n            }\n        }\n        while (i < list.size()) {\n            text.add(list.get(i++));\n        }\n        while (j < s.size()) {\n            text.add(s.get(j++));\n        }\n        return text;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int input, int n) {\n        if (n == 0) {\n            throw new IllegalArgumentException(\"n must not be zero\");\n        }\n        return (double) input / n;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_v2(int[] str) {\n        if (str == null || str.length == 0) {\n            throw new IllegalArgumentException(\"str must not be null or empty\");\n        }\n        int max = str[0];\n        for (int v : str) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowelsHelper(String n) {\n        if (n == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : n.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide(int nums, int list) {\n        if (list == 0) {\n            throw new IllegalArgumentException(\"list must not be zero\");\n        }\n        return (double) nums / list;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_v2(List<Integer> nums, List<Integer> value) {\n        if (nums == null || value == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> s = new ArrayList<>(nums.size() + value.size());\n        int i = 0, j = 0;\n        while (i < nums.size() && j < value.size()) {\n            if (nums.get(i) <= value.get(j)) {\n                s.add(nums.get(i++));\n            } else {\n                s.add(value.get(j++));\n            }\n        }\n        while (i < nums.size()) {\n            s.add(nums.get(i++));\n        }\n        while (j < value.size()) {\n            s.add(value.get(j++));\n        }\n        return s;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString_alt(String str) {\n        if (str == null) {\n            return null;\n        }\n        return new StringBuilder(str).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseStringEx(String list) {\n        if (list == null) {\n            return null;\n        }\n        return new StringBuilder(list).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString_new(String value) {\n        if (value == null) {\n            return null;\n        }\n        return new StringBuilder(value).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe_alt(String input) {\n        try {\n            return Integer.parseInt(input);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + input);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide(int value, int n) {\n        if (n == 0) {\n            throw new IllegalArgumentException(\"n must not be zero\");\n        }\n        return (double) value / n;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe_new(String text) {\n        try {\n            return Integer.parseInt(text);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + text);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int arr, int list) {\n        if (list == 0) {\n            throw new IllegalArgumentException(\"list must not be zero\");\n        }\n        return (double) arr / list;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> input, List<Integer> s) {\n        if (input == null || s == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> text = new ArrayList<>(input.size() + s.size());\n        int i = 0, j = 0;\n        while (i < input.size() && j < s.size()) {\n            if (input.get(i) <= s.get(j)) {\n                text.add(input.get(i++));\n            } else {\n                text.add(s.get(j++));\n            }\n        }\n        while (i < input.size()) {\n            text.add(input.get(i++));\n        }\n        while (j < s.size()) {\n            text.add(s.get(j++));\n        }\n        return text;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime_v2(int arr) {\n        if (arr < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= arr; i++) {\n            if (arr % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideHelper(int text, int value) {\n        if (value == 0) {\n            throw new IllegalArgumentException(\"value must not be zero\");\n        }\n        return (double) text / value;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe_alt(String value) {\n        try {\n            return Integer.parseInt(value);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + value);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels_alt(String s) {\n        if (s == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : s.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe_new(String input) {\n        try {\n            return Integer.parseInt(input);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + input);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_v2(List<Integer> n, List<Integer> value) {\n        if (n == null || value == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> value = new ArrayList<>(n.size() + value.size());\n        int i = 0, j = 0;\n        while (i < n.size() && j < value.size()) {\n            if (n.get(i) <= value.get(j)) {\n                value.add(n.get(i++));\n            } else {\n                value.add(value.get(j++));\n            }\n        }\n        while (i < n.size()) {\n            value.add(n.get(i++));\n        }\n        while (j < value.size()) {\n            value.add(value.get(j++));\n        }\n        return value;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels_v2(String str) {\n        if (str == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : str.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> arr, List<Integer> s) {\n        if (arr == null || s == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> input = new ArrayList<>(arr.size() + s.size());\n        int i = 0, j = 0;\n        while (i < arr.size() && j < s.size()) {\n            if (arr.get(i) <= s.get(j)) {\n                input.add(arr.get(i++));\n            } else {\n                input.add(s.get(j++));\n            }\n        }\n        while (i < arr.size()) {\n            input.add(arr.get(i++));\n        }\n        while (j < s.size()) {\n            input.add(s.get(j++));\n        }\n        return input;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedHelper(List<Integer> arr, List<Integer> s) {\n        if (arr == null || s == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> value = new ArrayList<>(arr.size() + s.size());\n        int i = 0, j = 0;\n        while (i < arr.size() && j < s.size()) {\n            if (arr.get(i) <= s.get(j)) {\n                value.add(arr.get(i++));\n            } else {\n                value.add(s.get(j++));\n            }\n        }\n        while (i < arr.size()) {\n            value.add(arr.get(i++));\n        }\n        while (j < s.size()) {\n            value.add(s.get(j++));\n        }\n        return value;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrimeHelper(int arr) {\n        if (arr < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= arr; i++) {\n            if (arr % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString(String text) {\n        if (text == null) {\n            return null;\n        }\n        return new StringBuilder(text).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> s, List<Integer> value) {\n        if (s == null || value == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> n = new ArrayList<>(s.size() + value.size());\n        int i = 0, j = 0;\n        while (i < s.size() && j < value.size()) {\n            if (s.get(i) <= value.get(j)) {\n                n.add(s.get(i++));\n            } else {\n                n.add(value.get(j++));\n            }\n        }\n        while (i < s.size()) {\n            n.add(s.get(i++));\n        }\n        while (j < value.size()) {\n            n.add(value.get(j++));\n        }\n        return n;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int maxHelper(int[] nums) {\n        if (nums == null || nums.length == 0) {\n            throw new IllegalArgumentException(\"nums must not be null or empty\");\n        }\n        int max = nums[0];\n        for (int v : nums) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> text, List<Integer> input) {\n        if (text == null || input == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> text = new ArrayList<>(text.size() + input.size());\n        int i = 0, j = 0;\n        while (i < text.size() && j < input.size()) {\n            if (text.get(i) <= input.get(j)) {\n                text.add(text.get(i++));\n            } else {\n                text.add(input.get(j++));\n            }\n        }\n        while (i < text.size()) {\n            text.add(text.get(i++));\n        }\n        while (j < input.size()) {\n            text.add(input.get(j++));\n        }\n        return text;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString_new(String arr) {\n        if (arr == null) {\n            return null;\n        }\n        return new StringBuilder(arr).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_new(int value, int n) {\n        if (n == 0) {\n            throw new IllegalArgumentException(\"n must not be zero\");\n        }\n        return (double) value / n;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels(String list) {\n        if (list == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : list.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> list, List<Integer> list) {\n        if (list == null || list == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> nums = new ArrayList<>(list.size() + list.size());\n        int i = 0, j = 0;\n        while (i < list.size() && j < list.size()) {\n            if (list.get(i) <= list.get(j)) {\n                nums.add(list.get(i++));\n            } else {\n                nums.add(list.get(j++));\n            }\n        }\n        while (i < list.size()) {\n            nums.add(list.get(i++));\n        }\n        while (j < list.size()) {\n            nums.add(list.get(j++));\n        }\n        return nums;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedHelper(List<Integer> text, List<Integer> nums) {\n        if (text == null || nums == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> n = new ArrayList<>(text.size() + nums.size());\n        int i = 0, j = 0;\n        while (i < text.size() && j < nums.size()) {\n            if (text.get(i) <= nums.get(j)) {\n                n.add(text.get(i++));\n            } else {\n                n.add(nums.get(j++));\n            }\n        }\n        while (i < text.size()) {\n            n.add(text.get(i++));\n        }\n        while (j < nums.size()) {\n            n.add(nums.get(j++));\n        }\n        return n;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide(int nums, int nums) {\n        if (nums == 0) {\n            throw new IllegalArgumentException(\"nums must not be zero\");\n        }\n        return (double) nums / nums;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels_alt(String list) {\n        if (list == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : list.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> list, List<Integer> text) {\n        if (list == null || text == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> list = new ArrayList<>(list.size() + text.size());\n        int i = 0, j = 0;\n        while (i < list.size() && j < text.size()) {\n            if (list.get(i) <= text.get(j)) {\n                list.add(list.get(i++));\n            } else {\n                list.add(text.get(j++));\n            }\n        }\n        while (i < list.size()) {\n            list.add(list.get(i++));\n        }\n        while (j < text.size()) {\n            list.add(text.get(j++));\n        }\n        return list;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_new(int n, int input) {\n        if (input == 0) {\n            throw new IllegalArgumentException(\"input must not be zero\");\n        }\n        return (double) n / input;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowelsEx(String str) {\n        if (str == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : str.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideEx(int list, int list) {\n        if (list == 0) {\n            throw new IllegalArgumentException(\"list must not be zero\");\n        }\n        return (double) list / list;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels_alt(String str) {\n        if (str == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : str.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> str, List<Integer> s) {\n        if (str == null || s == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> value = new ArrayList<>(str.size() + s.size());\n        int i = 0, j = 0;\n        while (i < str.size() && j < s.size()) {\n            if (str.get(i) <= s.get(j)) {\n                value.add(str.get(i++));\n            } else {\n                value.add(s.get(j++));\n            }\n        }\n        while (i < str.size()) {\n            value.add(str.get(i++));\n        }\n        while (j < s.size()) {\n            value.add(s.get(j++));\n        }\n        return value;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels_v2(String value) {\n        if (value == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : value.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide(int text, int nums) {\n        if (nums == 0) {\n            throw new IllegalArgumentException(\"nums must not be zero\");\n        }\n        return (double) text / nums;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedHelper(List<Integer> text, List<Integer> input) {\n        if (text == null || input == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> text = new ArrayList<>(text.size() + input.size());\n        int i = 0, j = 0;\n        while (i < text.size() && j < input.size()) {\n            if (text.get(i) <= input.get(j)) {\n                text.add(text.get(i++));\n            } else {\n                text.add(input.get(j++));\n            }\n        }\n        while (i < text.size()) {\n            text.add(text.get(i++));\n        }\n        while (j < input.size()) {\n            text.add(input.get(j++));\n        }\n        return text;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> nums, List<Integer> str) {\n        if (nums == null || str == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> arr = new ArrayList<>(nums.size() + str.size());\n        int i = 0, j = 0;\n        while (i < nums.size() && j < str.size()) {\n            if (nums.get(i) <= str.get(j)) {\n                arr.add(nums.get(i++));\n            } else {\n                arr.add(str.get(j++));\n            }\n        }\n        while (i < nums.size()) {\n            arr.add(nums.get(i++));\n        }\n        while (j < str.size()) {\n            arr.add(str.get(j++));\n        }\n        return arr;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString_alt(String s) {\n        if (s == null) {\n            return null;\n        }\n        return new StringBuilder(s).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels(String nums) {\n        if (nums == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : nums.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideEx(int list, int str) {\n        if (str == 0) {\n            throw new IllegalArgumentException(\"str must not be zero\");\n        }\n        return (double) list / str;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseStringHelper(String n) {\n        if (n == null) {\n            return null;\n        }\n        return new StringBuilder(n).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrimeEx(int text) {\n        if (text < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= text; i++) {\n            if (text % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_v2(List<Integer> text, List<Integer> str) {\n        if (text == null || str == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> value = new ArrayList<>(text.size() + str.size());\n        int i = 0, j = 0;\n        while (i < text.size() && j < str.size()) {\n            if (text.get(i) <= str.get(j)) {\n                value.add(text.get(i++));\n            } else {\n                value.add(str.get(j++));\n            }\n        }\n        while (i < text.size()) {\n            value.add(text.get(i++));\n        }\n        while (j < str.size()) {\n            value.add(str.get(j++));\n        }\n        return value;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedEx(List<Integer> s, List<Integer> value) {\n        if (s == null || value == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> text = new ArrayList<>(s.size() + value.size());\n        int i = 0, j = 0;\n        while (i < s.size() && j < value.size()) {\n            if (s.get(i) <= value.get(j)) {\n                text.add(s.get(i++));\n            } else {\n                text.add(value.get(j++));\n            }\n        }\n        while (i < s.size()) {\n            text.add(s.get(i++));\n        }\n        while (j < value.size()) {\n            text.add(value.get(j++));\n        }\n        return text;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedHelper(List<Integer> n, List<Integer> n) {\n        if (n == null || n == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> value = new ArrayList<>(n.size() + n.size());\n        int i = 0, j = 0;\n        while (i < n.size() && j < n.size()) {\n            if (n.get(i) <= n.get(j)) {\n                value.add(n.get(i++));\n            } else {\n                value.add(n.get(j++));\n            }\n        }\n        while (i < n.size()) {\n            value.add(n.get(i++));\n        }\n        while (j < n.size()) {\n            value.add(n.get(j++));\n        }\n        return value;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideEx(int list, int input) {\n        if (input == 0) {\n            throw new IllegalArgumentException(\"input must not be zero\");\n        }\n        return (double) list / input;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> value, List<Integer> input) {\n        if (value == null || input == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> s = new ArrayList<>(value.size() + input.size());\n        int i = 0, j = 0;\n        while (i < value.size() && j < input.size()) {\n            if (value.get(i) <= input.get(j)) {\n                s.add(value.get(i++));\n            } else {\n                s.add(input.get(j++));\n            }\n        }\n        while (i < value.size()) {\n            s.add(value.get(i++));\n        }\n        while (j < input.size()) {\n            s.add(input.get(j++));\n        }\n        return s;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_new(List<Integer> input, List<Integer> nums) {\n        if (input == null || nums == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> arr = new ArrayList<>(input.size() + nums.size());\n        int i = 0, j = 0;\n        while (i < input.size() && j < nums.size()) {\n            if (input.get(i) <= nums.get(j)) {\n                arr.add(input.get(i++));\n            } else {\n                arr.add(nums.get(j++));\n            }\n        }\n        while (i < input.size()) {\n            arr.add(input.get(i++));\n        }\n        while (j < nums.size()) {\n            arr.add(nums.get(j++));\n        }\n        return arr;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime_v2(int text) {\n        if (text < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= text; i++) {\n            if (text % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_new(int list, int str) {\n        if (str == 0) {\n            throw new IllegalArgumentException(\"str must not be zero\");\n        }\n        return (double) list / str;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide(int s, int text) {\n        if (text == 0) {\n            throw new IllegalArgumentException(\"text must not be zero\");\n        }\n        return (double) s / text;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels_v2(String input) {\n        if (input == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : input.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_v2(int arr, int nums) {\n        if (nums == 0) {\n            throw new IllegalArgumentException(\"nums must not be zero\");\n        }\n        return (double) arr / nums;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedEx(List<Integer> s, List<Integer> s) {\n        if (s == null || s == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> text = new ArrayList<>(s.size() + s.size());\n        int i = 0, j = 0;\n        while (i < s.size() && j < s.size()) {\n            if (s.get(i) <= s.get(j)) {\n                text.add(s.get(i++));\n            } else {\n                text.add(s.get(j++));\n            }\n        }\n        while (i < s.size()) {\n            text.add(s.get(i++));\n        }\n        while (j < s.size()) {\n            text.add(s.get(j++));\n        }\n        return text;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels_v2(String arr) {\n        if (arr == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : arr.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_v2(int[] nums) {\n        if (nums == null || nums.length == 0) {\n            throw new IllegalArgumentException(\"nums must not be null or empty\");\n        }\n        int max = nums[0];\n        for (int v : nums) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime(int text) {\n        if (text < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= text; i++) {\n            if (text % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> text, List<Integer> list) {\n        if (text == null || list == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> arr = new ArrayList<>(text.size() + list.size());\n        int i = 0, j = 0;\n        while (i < text.size() && j < list.size()) {\n            if (text.get(i) <= list.get(j)) {\n                arr.add(text.get(i++));\n            } else {\n                arr.add(list.get(j++));\n            }\n        }\n        while (i < text.size()) {\n            arr.add(text.get(i++));\n        }\n        while (j < list.size()) {\n            arr.add(list.get(j++));\n        }\n        return arr;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafeHelper(String value) {\n        try {\n            return Integer.parseInt(value);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + value);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> input, List<Integer> nums) {\n        if (input == null || nums == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> nums = new ArrayList<>(input.size() + nums.size());\n        int i = 0, j = 0;\n        while (i < input.size() && j < nums.size()) {\n            if (input.get(i) <= nums.get(j)) {\n                nums.add(input.get(i++));\n            } else {\n                nums.add(nums.get(j++));\n            }\n        }\n        while (i < input.size()) {\n            nums.add(input.get(i++));\n        }\n        while (j < nums.size()) {\n            nums.add(nums.get(j++));\n        }\n        return nums;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_v2(int value, int nums) {\n        if (nums == 0) {\n            throw new IllegalArgumentException(\"nums must not be zero\");\n        }\n        return (double) value / nums;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString_alt(String text) {\n        if (text == null) {\n            return null;\n        }\n        return new StringBuilder(text).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int text, int value) {\n        if (value == 0) {\n            throw new IllegalArgumentException(\"value must not be zero\");\n        }\n        return (double) text / value;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_v2(int[] list) {\n        if (list == null || list.length == 0) {\n            throw new IllegalArgumentException(\"list must not be null or empty\");\n        }\n        int max = list[0];\n        for (int v : list) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> arr, List<Integer> text) {\n        if (arr == null || text == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> text = new ArrayList<>(arr.size() + text.size());\n        int i = 0, j = 0;\n        while (i < arr.size() && j < text.size()) {\n            if (arr.get(i) <= text.get(j)) {\n                text.add(arr.get(i++));\n            } else {\n                text.add(text.get(j++));\n            }\n        }\n        while (i < arr.size()) {\n            text.add(arr.get(i++));\n        }\n        while (j < text.size()) {\n            text.add(text.get(j++));\n        }\n        return text;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_alt(int[] input) {\n        if (input == null || input.length == 0) {\n            throw new IllegalArgumentException(\"input must not be null or empty\");\n        }\n        int max = input[0];\n        for (int v : input) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> s, List<Integer> input) {\n        if (s == null || input == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> nums = new ArrayList<>(s.size() + input.size());\n        int i = 0, j = 0;\n        while (i < s.size() && j < input.size()) {\n            if (s.get(i) <= input.get(j)) {\n                nums.add(s.get(i++));\n            } else {\n                nums.add(input.get(j++));\n            }\n        }\n        while (i < s.size()) {\n            nums.add(s.get(i++));\n        }\n        while (j < input.size()) {\n            nums.add(input.get(j++));\n        }\n        return nums;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseStringHelper(String list) {\n        if (list == null) {\n            return null;\n        }\n        return new StringBuilder(list).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideEx(int s, int arr) {\n        if (arr == 0) {\n            throw new IllegalArgumentException(\"arr must not be zero\");\n        }\n        return (double) s / arr;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide(int value, int arr) {\n        if (arr == 0) {\n            throw new IllegalArgumentException(\"arr must not be zero\");\n        }\n        return (double) value / arr;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe(String nums) {\n        try {\n            return Integer.parseInt(nums);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + nums);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels_alt(String value) {\n        if (value == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : value.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> value, List<Integer> str) {\n        if (value == null || str == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> value = new ArrayList<>(value.size() + str.size());\n        int i = 0, j = 0;\n        while (i < value.size() && j < str.size()) {\n            if (value.get(i) <= str.get(j)) {\n                value.add(value.get(i++));\n            } else {\n                value.add(str.get(j++));\n            }\n        }\n        while (i < value.size()) {\n            value.add(value.get(i++));\n        }\n        while (j < str.size()) {\n            value.add(str.get(j++));\n        }\n        return value;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> arr, List<Integer> list) {\n        if (arr == null || list == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> s = new ArrayList<>(arr.size() + list.size());\n        int i = 0, j = 0;\n        while (i < arr.size() && j < list.size()) {\n            if (arr.get(i) <= list.get(j)) {\n                s.add(arr.get(i++));\n            } else {\n                s.add(list.get(j++));\n            }\n        }\n        while (i < arr.size()) {\n            s.add(arr.get(i++));\n        }\n        while (j < list.size()) {\n            s.add(list.get(j++));\n        }\n        return s;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> s, List<Integer> text) {\n        if (s == null || text == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> n = new ArrayList<>(s.size() + text.size());\n        int i = 0, j = 0;\n        while (i < s.size() && j < text.size()) {\n            if (s.get(i) <= text.get(j)) {\n                n.add(s.get(i++));\n            } else {\n                n.add(text.get(j++));\n            }\n        }\n        while (i < s.size()) {\n            n.add(s.get(i++));\n        }\n        while (j < text.size()) {\n            n.add(text.get(j++));\n        }\n        return n;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_alt(int[] arr) {\n        if (arr == null || arr.length == 0) {\n            throw new IllegalArgumentException(\"arr must not be null or empty\");\n        }\n        int max = arr[0];\n        for (int v : arr) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafeEx(String s) {\n        try {\n            return Integer.parseInt(s);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + s);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_new(int value, int s) {\n        if (s == 0) {\n            throw new IllegalArgumentException(\"s must not be zero\");\n        }\n        return (double) value / s;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime_alt(int str) {\n        if (str < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= str; i++) {\n            if (str % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> str, List<Integer> n) {\n        if (str == null || n == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> value = new ArrayList<>(str.size() + n.size());\n        int i = 0, j = 0;\n        while (i < str.size() && j < n.size()) {\n            if (str.get(i) <= n.get(j)) {\n                value.add(str.get(i++));\n            } else {\n                value.add(n.get(j++));\n            }\n        }\n        while (i < str.size()) {\n            value.add(str.get(i++));\n        }\n        while (j < n.size()) {\n            value.add(n.get(j++));\n        }\n        return value;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_new(int arr, int input) {\n        if (input == 0) {\n            throw new IllegalArgumentException(\"input must not be zero\");\n        }\n        return (double) arr / input;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_v2(int[] s) {\n        if (s == null || s.length == 0) {\n            throw new IllegalArgumentException(\"s must not be null or empty\");\n        }\n        int max = s[0];\n        for (int v : s) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> input, List<Integer> s) {\n        if (input == null || s == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> n = new ArrayList<>(input.size() + s.size());\n        int i = 0, j = 0;\n        while (i < input.size() && j < s.size()) {\n            if (input.get(i) <= s.get(j)) {\n                n.add(input.get(i++));\n            } else {\n                n.add(s.get(j++));\n            }\n        }\n        while (i < input.size()) {\n            n.add(input.get(i++));\n        }\n        while (j < s.size()) {\n            n.add(s.get(j++));\n        }\n        return n;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels(String n) {\n        if (n == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : n.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedHelper(List<Integer> nums, List<Integer> list) {\n        if (nums == null || list == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> list = new ArrayList<>(nums.size() + list.size());\n        int i = 0, j = 0;\n        while (i < nums.size() && j < list.size()) {\n            if (nums.get(i) <= list.get(j)) {\n                list.add(nums.get(i++));\n            } else {\n                list.add(list.get(j++));\n            }\n        }\n        while (i < nums.size()) {\n            list.add(nums.get(i++));\n        }\n        while (j < list.size()) {\n            list.add(list.get(j++));\n        }\n        return list;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString_v2(String str) {\n        if (str == null) {\n            return null;\n        }\n        return new StringBuilder(str).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString_new(String text) {\n        if (text == null) {\n            return null;\n        }\n        return new StringBuilder(text).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideHelper(int arr, int n) {\n        if (n == 0) {\n            throw new IllegalArgumentException(\"n must not be zero\");\n        }\n        return (double) arr / n;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrimeHelper(int input) {\n        if (input < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= input; i++) {\n            if (input % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString_new(String s) {\n        if (s == null) {\n            return null;\n        }\n        return new StringBuilder(s).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedEx(List<Integer> nums, List<Integer> nums) {\n        if (nums == null || nums == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> n = new ArrayList<>(nums.size() + nums.size());\n        int i = 0, j = 0;\n        while (i < nums.size() && j < nums.size()) {\n            if (nums.get(i) <= nums.get(j)) {\n                n.add(nums.get(i++));\n            } else {\n                n.add(nums.get(j++));\n            }\n        }\n        while (i < nums.size()) {\n            n.add(nums.get(i++));\n        }\n        while (j < nums.size()) {\n            n.add(nums.get(j++));\n        }\n        return n;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafeEx(String arr) {\n        try {\n            return Integer.parseInt(arr);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + arr);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseStringHelper(String s) {\n        if (s == null) {\n            return null;\n        }\n        return new StringBuilder(s).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowelsEx(String text) {\n        if (text == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : text.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideEx(int value, int str) {\n        if (str == 0) {\n            throw new IllegalArgumentException(\"str must not be zero\");\n        }\n        return (double) value / str;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max(int[] str) {\n        if (str == null || str.length == 0) {\n            throw new IllegalArgumentException(\"str must not be null or empty\");\n        }\n        int max = str[0];\n        for (int v : str) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_alt(int[] nums) {\n        if (nums == null || nums.length == 0) {\n            throw new IllegalArgumentException(\"nums must not be null or empty\");\n        }\n        int max = nums[0];\n        for (int v : nums) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedEx(List<Integer> arr, List<Integer> value) {\n        if (arr == null || value == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> str = new ArrayList<>(arr.size() + value.size());\n        int i = 0, j = 0;\n        while (i < arr.size() && j < value.size()) {\n            if (arr.get(i) <= value.get(j)) {\n                str.add(arr.get(i++));\n            } else {\n                str.add(value.get(j++));\n            }\n        }\n        while (i < arr.size()) {\n            str.add(arr.get(i++));\n        }\n        while (j < value.size()) {\n            str.add(value.get(j++));\n        }\n        return str;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> n, List<Integer> input) {\n        if (n == null || input == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> list = new ArrayList<>(n.size() + input.size());\n        int i = 0, j = 0;\n        while (i < n.size() && j < input.size()) {\n            if (n.get(i) <= input.get(j)) {\n                list.add(n.get(i++));\n            } else {\n                list.add(input.get(j++));\n            }\n        }\n        while (i < n.size()) {\n            list.add(n.get(i++));\n        }\n        while (j < input.size()) {\n            list.add(input.get(j++));\n        }\n        return list;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int value, int s) {\n        if (s == 0) {\n            throw new IllegalArgumentException(\"s must not be zero\");\n        }\n        return (double) value / s;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedEx(List<Integer> list, List<Integer> input) {\n        if (list == null || input == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> s = new ArrayList<>(list.size() + input.size());\n        int i = 0, j = 0;\n        while (i < list.size() && j < input.size()) {\n            if (list.get(i) <= input.get(j)) {\n                s.add(list.get(i++));\n            } else {\n                s.add(input.get(j++));\n            }\n        }\n        while (i < list.size()) {\n            s.add(list.get(i++));\n        }\n        while (j < input.size()) {\n            s.add(input.get(j++));\n        }\n        return s;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> arr, List<Integer> text) {\n        if (arr == null || text == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> list = new ArrayList<>(arr.size() + text.size());\n        int i = 0, j = 0;\n        while (i < arr.size() && j < text.size()) {\n            if (arr.get(i) <= text.get(j)) {\n                list.add(arr.get(i++));\n            } else {\n                list.add(text.get(j++));\n            }\n        }\n        while (i < arr.size()) {\n            list.add(arr.get(i++));\n        }\n        while (j < text.size()) {\n            list.add(text.get(j++));\n        }\n        return list;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideEx(int input, int text) {\n        if (text == 0) {\n            throw new IllegalArgumentException(\"text must not be zero\");\n        }\n        return (double) input / text;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString_v2(String list) {\n        if (list == null) {\n            return null;\n        }\n        return new StringBuilder(list).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideHelper(int str, int s) {\n        if (s == 0) {\n            throw new IllegalArgumentException(\"s must not be zero\");\n        }\n        return (double) str / s;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> s, List<Integer> input) {\n        if (s == null || input == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> input = new ArrayList<>(s.size() + input.size());\n        int i = 0, j = 0;\n        while (i < s.size() && j < input.size()) {\n            if (s.get(i) <= input.get(j)) {\n                input.add(s.get(i++));\n            } else {\n                input.add(input.get(j++));\n            }\n        }\n        while (i < s.size()) {\n            input.add(s.get(i++));\n        }\n        while (j < input.size()) {\n            input.add(input.get(j++));\n        }\n        return input;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideHelper(int arr, int s) {\n        if (s == 0) {\n            throw new IllegalArgumentException(\"s must not be zero\");\n        }\n        return (double) arr / s;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedHelper(List<Integer> n, List<Integer> list) {\n        if (n == null || list == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> str = new ArrayList<>(n.size() + list.size());\n        int i = 0, j = 0;\n        while (i < n.size() && j < list.size()) {\n            if (n.get(i) <= list.get(j)) {\n                str.add(n.get(i++));\n            } else {\n                str.add(list.get(j++));\n            }\n        }\n        while (i < n.size()) {\n            str.add(n.get(i++));\n        }\n        while (j < list.size()) {\n            str.add(list.get(j++));\n        }\n        return str;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int s, int arr) {\n        if (arr == 0) {\n            throw new IllegalArgumentException(\"arr must not be zero\");\n        }\n        return (double) s / arr;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_v2(List<Integer> value, List<Integer> list) {\n        if (value == null || list == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> nums = new ArrayList<>(value.size() + list.size());\n        int i = 0, j = 0;\n        while (i < value.size() && j < list.size()) {\n            if (value.get(i) <= list.get(j)) {\n                nums.add(value.get(i++));\n            } else {\n                nums.add(list.get(j++));\n            }\n        }\n        while (i < value.size()) {\n            nums.add(value.get(i++));\n        }\n        while (j < list.size()) {\n            nums.add(list.get(j++));\n        }\n        return nums;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_new(List<Integer> nums, List<Integer> value) {\n        if (nums == null || value == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> list = new ArrayList<>(nums.size() + value.size());\n        int i = 0, j = 0;\n        while (i < nums.size() && j < value.size()) {\n            if (nums.get(i) <= value.get(j)) {\n                list.add(nums.get(i++));\n            } else {\n                list.add(value.get(j++));\n            }\n        }\n        while (i < nums.size()) {\n            list.add(nums.get(i++));\n        }\n        while (j < value.size()) {\n            list.add(value.get(j++));\n        }\n        return list;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> input, List<Integer> input) {\n        if (input == null || input == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> list = new ArrayList<>(input.size() + input.size());\n        int i = 0, j = 0;\n        while (i < input.size() && j < input.size()) {\n            if (input.get(i) <= input.get(j)) {\n                list.add(input.get(i++));\n            } else {\n                list.add(input.get(j++));\n            }\n        }\n        while (i < input.size()) {\n            list.add(input.get(i++));\n        }\n        while (j < input.size()) {\n            list.add(input.get(j++));\n        }\n        return list;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_v2(List<Integer> s, List<Integer> list) {\n        if (s == null || list == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> arr = new ArrayList<>(s.size() + list.size());\n        int i = 0, j = 0;\n        while (i < s.size() && j < list.size()) {\n            if (s.get(i) <= list.get(j)) {\n                arr.add(s.get(i++));\n            } else {\n                arr.add(list.get(j++));\n            }\n        }\n        while (i < s.size()) {\n            arr.add(s.get(i++));\n        }\n        while (j < list.size()) {\n            arr.add(list.get(j++));\n        }\n        return arr;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> value, List<Integer> str) {\n        if (value == null || str == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> s = new ArrayList<>(value.size() + str.size());\n        int i = 0, j = 0;\n        while (i < value.size() && j < str.size()) {\n            if (value.get(i) <= str.get(j)) {\n                s.add(value.get(i++));\n            } else {\n                s.add(str.get(j++));\n            }\n        }\n        while (i < value.size()) {\n            s.add(value.get(i++));\n        }\n        while (j < str.size()) {\n            s.add(str.get(j++));\n        }\n        return s;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int maxEx(int[] value) {\n        if (value == null || value.length == 0) {\n            throw new IllegalArgumentException(\"value must not be null or empty\");\n        }\n        int max = value[0];\n        for (int v : value) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int text, int list) {\n        if (list == 0) {\n            throw new IllegalArgumentException(\"list must not be zero\");\n        }\n        return (double) text / list;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_new(List<Integer> s, List<Integer> list) {\n        if (s == null || list == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> n = new ArrayList<>(s.size() + list.size());\n        int i = 0, j = 0;\n        while (i < s.size() && j < list.size()) {\n            if (s.get(i) <= list.get(j)) {\n                n.add(s.get(i++));\n            } else {\n                n.add(list.get(j++));\n            }\n        }\n        while (i < s.size()) {\n            n.add(s.get(i++));\n        }\n        while (j < list.size()) {\n            n.add(list.get(j++));\n        }\n        return n;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseStringHelper(String arr) {\n        if (arr == null) {\n            return null;\n        }\n        return new StringBuilder(arr).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_v2(int input, int list) {\n        if (list == 0) {\n            throw new IllegalArgumentException(\"list must not be zero\");\n        }\n        return (double) input / list;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> text, List<Integer> value) {\n        if (text == null || value == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> input = new ArrayList<>(text.size() + value.size());\n        int i = 0, j = 0;\n        while (i < text.size() && j < value.size()) {\n            if (text.get(i) <= value.get(j)) {\n                input.add(text.get(i++));\n            } else {\n                input.add(value.get(j++));\n            }\n        }\n        while (i < text.size()) {\n            input.add(text.get(i++));\n        }\n        while (j < value.size()) {\n            input.add(value.get(j++));\n        }\n        return input;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafeEx(String list) {\n        try {\n            return Integer.parseInt(list);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + list);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int arr, int n) {\n        if (n == 0) {\n            throw new IllegalArgumentException(\"n must not be zero\");\n        }\n        return (double) arr / n;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels_v2(String s) {\n        if (s == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : s.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> text, List<Integer> n) {\n        if (text == null || n == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> s = new ArrayList<>(text.size() + n.size());\n        int i = 0, j = 0;\n        while (i < text.size() && j < n.size()) {\n            if (text.get(i) <= n.get(j)) {\n                s.add(text.get(i++));\n            } else {\n                s.add(n.get(j++));\n            }\n        }\n        while (i < text.size()) {\n            s.add(text.get(i++));\n        }\n        while (j < n.size()) {\n            s.add(n.get(j++));\n        }\n        return s;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> s, List<Integer> str) {\n        if (s == null || str == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> n = new ArrayList<>(s.size() + str.size());\n        int i = 0, j = 0;\n        while (i < s.size() && j < str.size()) {\n            if (s.get(i) <= str.get(j)) {\n                n.add(s.get(i++));\n            } else {\n                n.add(str.get(j++));\n            }\n        }\n        while (i < s.size()) {\n            n.add(s.get(i++));\n        }\n        while (j < str.size()) {\n            n.add(str.get(j++));\n        }\n        return n;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe(String input) {\n        try {\n            return Integer.parseInt(input);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + input);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_new(List<Integer> value, List<Integer> text) {\n        if (value == null || text == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> nums = new ArrayList<>(value.size() + text.size());\n        int i = 0, j = 0;\n        while (i < value.size() && j < text.size()) {\n            if (value.get(i) <= text.get(j)) {\n                nums.add(value.get(i++));\n            } else {\n                nums.add(text.get(j++));\n            }\n        }\n        while (i < value.size()) {\n            nums.add(value.get(i++));\n        }\n        while (j < text.size()) {\n            nums.add(text.get(j++));\n        }\n        return nums;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowelsHelper(String str) {\n        if (str == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : str.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrimeEx(int n) {\n        if (n < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= n; i++) {\n            if (n % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_v2(List<Integer> str, List<Integer> list) {\n        if (str == null || list == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> n = new ArrayList<>(str.size() + list.size());\n        int i = 0, j = 0;\n        while (i < str.size() && j < list.size()) {\n            if (str.get(i) <= list.get(j)) {\n                n.add(str.get(i++));\n            } else {\n                n.add(list.get(j++));\n            }\n        }\n        while (i < str.size()) {\n            n.add(str.get(i++));\n        }\n        while (j < list.size()) {\n            n.add(list.get(j++));\n        }\n        return n;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int maxHelper(int[] input) {\n        if (input == null || input.length == 0) {\n            throw new IllegalArgumentException(\"input must not be null or empty\");\n        }\n        int max = input[0];\n        for (int v : input) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_new(int n, int text) {\n        if (text == 0) {\n            throw new IllegalArgumentException(\"text must not be zero\");\n        }\n        return (double) n / text;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideEx(int text, int s) {\n        if (s == 0) {\n            throw new IllegalArgumentException(\"s must not be zero\");\n        }\n        return (double) text / s;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_new(int[] arr) {\n        if (arr == null || arr.length == 0) {\n            throw new IllegalArgumentException(\"arr must not be null or empty\");\n        }\n        int max = arr[0];\n        for (int v : arr) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int maxHelper(int[] list) {\n        if (list == null || list.length == 0) {\n            throw new IllegalArgumentException(\"list must not be null or empty\");\n        }\n        int max = list[0];\n        for (int v : list) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> s, List<Integer> input) {\n        if (s == null || input == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> str = new ArrayList<>(s.size() + input.size());\n        int i = 0, j = 0;\n        while (i < s.size() && j < input.size()) {\n            if (s.get(i) <= input.get(j)) {\n                str.add(s.get(i++));\n            } else {\n                str.add(input.get(j++));\n            }\n        }\n        while (i < s.size()) {\n            str.add(s.get(i++));\n        }\n        while (j < input.size()) {\n            str.add(input.get(j++));\n        }\n        return str;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrimeHelper(int s) {\n        if (s < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= s; i++) {\n            if (s % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_v2(int nums, int arr) {\n        if (arr == 0) {\n            throw new IllegalArgumentException(\"arr must not be zero\");\n        }\n        return (double) nums / arr;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafeHelper(String s) {\n        try {\n            return Integer.parseInt(s);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + s);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide(int nums, int value) {\n        if (value == 0) {\n            throw new IllegalArgumentException(\"value must not be zero\");\n        }\n        return (double) nums / value;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_v2(List<Integer> input, List<Integer> value) {\n        if (input == null || value == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> arr = new ArrayList<>(input.size() + value.size());\n        int i = 0, j = 0;\n        while (i < input.size() && j < value.size()) {\n            if (input.get(i) <= value.get(j)) {\n                arr.add(input.get(i++));\n            } else {\n                arr.add(value.get(j++));\n            }\n        }\n        while (i < input.size()) {\n            arr.add(input.get(i++));\n        }\n        while (j < value.size()) {\n            arr.add(value.get(j++));\n        }\n        return arr;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString_v2(String s) {\n        if (s == null) {\n            return null;\n        }\n        return new StringBuilder(s).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe_alt(String text) {\n        try {\n            return Integer.parseInt(text);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + text);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe_v2(String text) {\n        try {\n            return Integer.parseInt(text);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + text);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_v2(List<Integer> arr, List<Integer> nums) {\n        if (arr == null || nums == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> str = new ArrayList<>(arr.size() + nums.size());\n        int i = 0, j = 0;\n        while (i < arr.size() && j < nums.size()) {\n            if (arr.get(i) <= nums.get(j)) {\n                str.add(arr.get(i++));\n            } else {\n                str.add(nums.get(j++));\n            }\n        }\n        while (i < arr.size()) {\n            str.add(arr.get(i++));\n        }\n        while (j < nums.size()) {\n            str.add(nums.get(j++));\n        }\n        return str;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideEx(int value, int list) {\n        if (list == 0) {\n            throw new IllegalArgumentException(\"list must not be zero\");\n        }\n        return (double) value / list;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseStringHelper(String nums) {\n        if (nums == null) {\n            return null;\n        }\n        return new StringBuilder(nums).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_v2(List<Integer> str, List<Integer> value) {\n        if (str == null || value == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> value = new ArrayList<>(str.size() + value.size());\n        int i = 0, j = 0;\n        while (i < str.size() && j < value.size()) {\n            if (str.get(i) <= value.get(j)) {\n                value.add(str.get(i++));\n            } else {\n                value.add(value.get(j++));\n            }\n        }\n        while (i < str.size()) {\n            value.add(str.get(i++));\n        }\n        while (j < value.size()) {\n            value.add(value.get(j++));\n        }\n        return value;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_v2(int nums, int s) {\n        if (s == 0) {\n            throw new IllegalArgumentException(\"s must not be zero\");\n        }\n        return (double) nums / s;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedHelper(List<Integer> text, List<Integer> text) {\n        if (text == null || text == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> list = new ArrayList<>(text.size() + text.size());\n        int i = 0, j = 0;\n        while (i < text.size() && j < text.size()) {\n            if (text.get(i) <= text.get(j)) {\n                list.add(text.get(i++));\n            } else {\n                list.add(text.get(j++));\n            }\n        }\n        while (i < text.size()) {\n            list.add(text.get(i++));\n        }\n        while (j < text.size()) {\n            list.add(text.get(j++));\n        }\n        return list;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int value, int text) {\n        if (text == 0) {\n            throw new IllegalArgumentException(\"text must not be zero\");\n        }\n        return (double) value / text;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_v2(List<Integer> s, List<Integer> text) {\n        if (s == null || text == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> input = new ArrayList<>(s.size() + text.size());\n        int i = 0, j = 0;\n        while (i < s.size() && j < text.size()) {\n            if (s.get(i) <= text.get(j)) {\n                input.add(s.get(i++));\n            } else {\n                input.add(text.get(j++));\n            }\n        }\n        while (i < s.size()) {\n            input.add(s.get(i++));\n        }\n        while (j < text.size()) {\n            input.add(text.get(j++));\n        }\n        return input;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedHelper(List<Integer> list, List<Integer> input) {\n        if (list == null || input == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> input = new ArrayList<>(list.size() + input.size());\n        int i = 0, j = 0;\n        while (i < list.size() && j < input.size()) {\n            if (list.get(i) <= input.get(j)) {\n                input.add(list.get(i++));\n            } else {\n                input.add(input.get(j++));\n            }\n        }\n        while (i < list.size()) {\n            input.add(list.get(i++));\n        }\n        while (j < input.size()) {\n            input.add(input.get(j++));\n        }\n        return input;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_v2(List<Integer> value, List<Integer> list) {\n        if (value == null || list == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> text = new ArrayList<>(value.size() + list.size());\n        int i = 0, j = 0;\n        while (i < value.size() && j < list.size()) {\n            if (value.get(i) <= list.get(j)) {\n                text.add(value.get(i++));\n            } else {\n                text.add(list.get(j++));\n            }\n        }\n        while (i < value.size()) {\n            text.add(value.get(i++));\n        }\n        while (j < list.size()) {\n            text.add(list.get(j++));\n        }\n        return text;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe_v2(String list) {\n        try {\n            return Integer.parseInt(list);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + list);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int maxEx(int[] n) {\n        if (n == null || n.length == 0) {\n            throw new IllegalArgumentException(\"n must not be null or empty\");\n        }\n        int max = n[0];\n        for (int v : n) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString(String value) {\n        if (value == null) {\n            return null;\n        }\n        return new StringBuilder(value).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_alt(int[] s) {\n        if (s == null || s.length == 0) {\n            throw new IllegalArgumentException(\"s must not be null or empty\");\n        }\n        int max = s[0];\n        for (int v : s) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedHelper(List<Integer> text, List<Integer> arr) {\n        if (text == null || arr == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> nums = new ArrayList<>(text.size() + arr.size());\n        int i = 0, j = 0;\n        while (i < text.size() && j < arr.size()) {\n            if (text.get(i) <= arr.get(j)) {\n                nums.add(text.get(i++));\n            } else {\n                nums.add(arr.get(j++));\n            }\n        }\n        while (i < text.size()) {\n            nums.add(text.get(i++));\n        }\n        while (j < arr.size()) {\n            nums.add(arr.get(j++));\n        }\n        return nums;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int value, int arr) {\n        if (arr == 0) {\n            throw new IllegalArgumentException(\"arr must not be zero\");\n        }\n        return (double) value / arr;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int str, int text) {\n        if (text == 0) {\n            throw new IllegalArgumentException(\"text must not be zero\");\n        }\n        return (double) str / text;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide(int value, int list) {\n        if (list == 0) {\n            throw new IllegalArgumentException(\"list must not be zero\");\n        }\n        return (double) value / list;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels_new(String arr) {\n        if (arr == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : arr.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowelsHelper(String text) {\n        if (text == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : text.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> s, List<Integer> arr) {\n        if (s == null || arr == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> text = new ArrayList<>(s.size() + arr.size());\n        int i = 0, j = 0;\n        while (i < s.size() && j < arr.size()) {\n            if (s.get(i) <= arr.get(j)) {\n                text.add(s.get(i++));\n            } else {\n                text.add(arr.get(j++));\n            }\n        }\n        while (i < s.size()) {\n            text.add(s.get(i++));\n        }\n        while (j < arr.size()) {\n            text.add(arr.get(j++));\n        }\n        return text;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_v2(int s, int n) {\n        if (n == 0) {\n            throw new IllegalArgumentException(\"n must not be zero\");\n        }\n        return (double) s / n;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrimeEx(int list) {\n        if (list < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= list; i++) {\n            if (list % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideHelper(int nums, int list) {\n        if (list == 0) {\n            throw new IllegalArgumentException(\"list must not be zero\");\n        }\n        return (double) nums / list;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrimeHelper(int value) {\n        if (value < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= value; i++) {\n            if (value % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels(String input) {\n        if (input == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : input.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowelsEx(String list) {\n        if (list == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : list.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrimeHelper(int nums) {\n        if (nums < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= nums; i++) {\n            if (nums % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_new(int s, int nums) {\n        if (nums == 0) {\n            throw new IllegalArgumentException(\"nums must not be zero\");\n        }\n        return (double) s / nums;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_new(int[] s) {\n        if (s == null || s.length == 0) {\n            throw new IllegalArgumentException(\"s must not be null or empty\");\n        }\n        int max = s[0];\n        for (int v : s) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideHelper(int value, int n) {\n        if (n == 0) {\n            throw new IllegalArgumentException(\"n must not be zero\");\n        }\n        return (double) value / n;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> arr, List<Integer> list) {\n        if (arr == null || list == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> value = new ArrayList<>(arr.size() + list.size());\n        int i = 0, j = 0;\n        while (i < arr.size() && j < list.size()) {\n            if (arr.get(i) <= list.get(j)) {\n                value.add(arr.get(i++));\n            } else {\n                value.add(list.get(j++));\n            }\n        }\n        while (i < arr.size()) {\n            value.add(arr.get(i++));\n        }\n        while (j < list.size()) {\n            value.add(list.get(j++));\n        }\n        return value;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_new(int input, int list) {\n        if (list == 0) {\n            throw new IllegalArgumentException(\"list must not be zero\");\n        }\n        return (double) input / list;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide(int input, int input) {\n        if (input == 0) {\n            throw new IllegalArgumentException(\"input must not be zero\");\n        }\n        return (double) input / input;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> list, List<Integer> nums) {\n        if (list == null || nums == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> input = new ArrayList<>(list.size() + nums.size());\n        int i = 0, j = 0;\n        while (i < list.size() && j < nums.size()) {\n            if (list.get(i) <= nums.get(j)) {\n                input.add(list.get(i++));\n            } else {\n                input.add(nums.get(j++));\n            }\n        }\n        while (i < list.size()) {\n            input.add(list.get(i++));\n        }\n        while (j < nums.size()) {\n            input.add(nums.get(j++));\n        }\n        return input;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowelsEx(String arr) {\n        if (arr == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : arr.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int maxHelper(int[] value) {\n        if (value == null || value.length == 0) {\n            throw new IllegalArgumentException(\"value must not be null or empty\");\n        }\n        int max = value[0];\n        for (int v : value) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideHelper(int nums, int n) {\n        if (n == 0) {\n            throw new IllegalArgumentException(\"n must not be zero\");\n        }\n        return (double) nums / n;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max_new(int[] text) {\n        if (text == null || text.length == 0) {\n            throw new IllegalArgumentException(\"text must not be null or empty\");\n        }\n        int max = text[0];\n        for (int v : text) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedEx(List<Integer> n, List<Integer> input) {\n        if (n == null || input == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> list = new ArrayList<>(n.size() + input.size());\n        int i = 0, j = 0;\n        while (i < n.size() && j < input.size()) {\n            if (n.get(i) <= input.get(j)) {\n                list.add(n.get(i++));\n            } else {\n                list.add(input.get(j++));\n            }\n        }\n        while (i < n.size()) {\n            list.add(n.get(i++));\n        }\n        while (j < input.size()) {\n            list.add(input.get(j++));\n        }\n        return list;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideEx(int arr, int arr) {\n        if (arr == 0) {\n            throw new IllegalArgumentException(\"arr must not be zero\");\n        }\n        return (double) arr / arr;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_new(List<Integer> n, List<Integer> value) {\n        if (n == null || value == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> input = new ArrayList<>(n.size() + value.size());\n        int i = 0, j = 0;\n        while (i < n.size() && j < value.size()) {\n            if (n.get(i) <= value.get(j)) {\n                input.add(n.get(i++));\n            } else {\n                input.add(value.get(j++));\n            }\n        }\n        while (i < n.size()) {\n            input.add(n.get(i++));\n        }\n        while (j < value.size()) {\n            input.add(value.get(j++));\n        }\n        return input;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> s, List<Integer> nums) {\n        if (s == null || nums == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> value = new ArrayList<>(s.size() + nums.size());\n        int i = 0, j = 0;\n        while (i < s.size() && j < nums.size()) {\n            if (s.get(i) <= nums.get(j)) {\n                value.add(s.get(i++));\n            } else {\n                value.add(nums.get(j++));\n            }\n        }\n        while (i < s.size()) {\n            value.add(s.get(i++));\n        }\n        while (j < nums.size()) {\n            value.add(nums.get(j++));\n        }\n        return value;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafeHelper(String text) {\n        try {\n            return Integer.parseInt(text);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + text);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_v2(int list, int text) {\n        if (text == 0) {\n            throw new IllegalArgumentException(\"text must not be zero\");\n        }\n        return (double) list / text;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime(int s) {\n        if (s < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= s; i++) {\n            if (s % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide(int s, int input) {\n        if (input == 0) {\n            throw new IllegalArgumentException(\"input must not be zero\");\n        }\n        return (double) s / input;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe_v2(String nums) {\n        try {\n            return Integer.parseInt(nums);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + nums);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> str, List<Integer> arr) {\n        if (str == null || arr == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> text = new ArrayList<>(str.size() + arr.size());\n        int i = 0, j = 0;\n        while (i < str.size() && j < arr.size()) {\n            if (str.get(i) <= arr.get(j)) {\n                text.add(str.get(i++));\n            } else {\n                text.add(arr.get(j++));\n            }\n        }\n        while (i < str.size()) {\n            text.add(str.get(i++));\n        }\n        while (j < arr.size()) {\n            text.add(arr.get(j++));\n        }\n        return text;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime_new(int str) {\n        if (str < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= str; i++) {\n            if (str % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_new(List<Integer> s, List<Integer> str) {\n        if (s == null || str == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> n = new ArrayList<>(s.size() + str.size());\n        int i = 0, j = 0;\n        while (i < s.size() && j < str.size()) {\n            if (s.get(i) <= str.get(j)) {\n                n.add(s.get(i++));\n            } else {\n                n.add(str.get(j++));\n            }\n        }\n        while (i < s.size()) {\n            n.add(s.get(i++));\n        }\n        while (j < str.size()) {\n            n.add(str.get(j++));\n        }\n        return n;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafeEx(String text) {\n        try {\n            return Integer.parseInt(text);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + text);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideHelper(int arr, int str) {\n        if (str == 0) {\n            throw new IllegalArgumentException(\"str must not be zero\");\n        }\n        return (double) arr / str;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels_new(String nums) {\n        if (nums == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : nums.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideHelper(int list, int text) {\n        if (text == 0) {\n            throw new IllegalArgumentException(\"text must not be zero\");\n        }\n        return (double) list / text;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe_new(String n) {\n        try {\n            return Integer.parseInt(n);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + n);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_v2(int text, int input) {\n        if (input == 0) {\n            throw new IllegalArgumentException(\"input must not be zero\");\n        }\n        return (double) text / input;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> n, List<Integer> input) {\n        if (n == null || input == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> value = new ArrayList<>(n.size() + input.size());\n        int i = 0, j = 0;\n        while (i < n.size() && j < input.size()) {\n            if (n.get(i) <= input.get(j)) {\n                value.add(n.get(i++));\n            } else {\n                value.add(input.get(j++));\n            }\n        }\n        while (i < n.size()) {\n            value.add(n.get(i++));\n        }\n        while (j < input.size()) {\n            value.add(input.get(j++));\n        }\n        return value;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedEx(List<Integer> text, List<Integer> arr) {\n        if (text == null || arr == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> list = new ArrayList<>(text.size() + arr.size());\n        int i = 0, j = 0;\n        while (i < text.size() && j < arr.size()) {\n            if (text.get(i) <= arr.get(j)) {\n                list.add(text.get(i++));\n            } else {\n                list.add(arr.get(j++));\n            }\n        }\n        while (i < text.size()) {\n            list.add(text.get(i++));\n        }\n        while (j < arr.size()) {\n            list.add(arr.get(j++));\n        }\n        return list;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime_v2(int input) {\n        if (input < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= input; i++) {\n            if (input % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideEx(int n, int input) {\n        if (input == 0) {\n            throw new IllegalArgumentException(\"input must not be zero\");\n        }\n        return (double) n / input;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedEx(List<Integer> str, List<Integer> arr) {\n        if (str == null || arr == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> arr = new ArrayList<>(str.size() + arr.size());\n        int i = 0, j = 0;\n        while (i < str.size() && j < arr.size()) {\n            if (str.get(i) <= arr.get(j)) {\n                arr.add(str.get(i++));\n            } else {\n                arr.add(arr.get(j++));\n            }\n        }\n        while (i < str.size()) {\n            arr.add(str.get(i++));\n        }\n        while (j < arr.size()) {\n            arr.add(arr.get(j++));\n        }\n        return arr;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_v2(int text, int list) {\n        if (list == 0) {\n            throw new IllegalArgumentException(\"list must not be zero\");\n        }\n        return (double) text / list;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_v2(int nums, int n) {\n        if (n == 0) {\n            throw new IllegalArgumentException(\"n must not be zero\");\n        }\n        return (double) nums / n;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_v2(List<Integer> text, List<Integer> list) {\n        if (text == null || list == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> n = new ArrayList<>(text.size() + list.size());\n        int i = 0, j = 0;\n        while (i < text.size() && j < list.size()) {\n            if (text.get(i) <= list.get(j)) {\n                n.add(text.get(i++));\n            } else {\n                n.add(list.get(j++));\n            }\n        }\n        while (i < text.size()) {\n            n.add(text.get(i++));\n        }\n        while (j < list.size()) {\n            n.add(list.get(j++));\n        }\n        return n;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> list, List<Integer> list) {\n        if (list == null || list == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> text = new ArrayList<>(list.size() + list.size());\n        int i = 0, j = 0;\n        while (i < list.size() && j < list.size()) {\n            if (list.get(i) <= list.get(j)) {\n                text.add(list.get(i++));\n            } else {\n                text.add(list.get(j++));\n            }\n        }\n        while (i < list.size()) {\n            text.add(list.get(i++));\n        }\n        while (j < list.size()) {\n            text.add(list.get(j++));\n        }\n        return text;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int text, int s) {\n        if (s == 0) {\n            throw new IllegalArgumentException(\"s must not be zero\");\n        }\n        return (double) text / s;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime_alt(int arr) {\n        if (arr < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= arr; i++) {\n            if (arr % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> s, List<Integer> list) {\n        if (s == null || list == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> s = new ArrayList<>(s.size() + list.size());\n        int i = 0, j = 0;\n        while (i < s.size() && j < list.size()) {\n            if (s.get(i) <= list.get(j)) {\n                s.add(s.get(i++));\n            } else {\n                s.add(list.get(j++));\n            }\n        }\n        while (i < s.size()) {\n            s.add(s.get(i++));\n        }\n        while (j < list.size()) {\n            s.add(list.get(j++));\n        }\n        return s;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> arr, List<Integer> n) {\n        if (arr == null || n == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> input = new ArrayList<>(arr.size() + n.size());\n        int i = 0, j = 0;\n        while (i < arr.size() && j < n.size()) {\n            if (arr.get(i) <= n.get(j)) {\n                input.add(arr.get(i++));\n            } else {\n                input.add(n.get(j++));\n            }\n        }\n        while (i < arr.size()) {\n            input.add(arr.get(i++));\n        }\n        while (j < n.size()) {\n            input.add(n.get(j++));\n        }\n        return input;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafe(String text) {\n        try {\n            return Integer.parseInt(text);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + text);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_new(int input, int arr) {\n        if (arr == 0) {\n            throw new IllegalArgumentException(\"arr must not be zero\");\n        }\n        return (double) input / arr;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels_v2(String text) {\n        if (text == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : text.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString(String list) {\n        if (list == null) {\n            return null;\n        }\n        return new StringBuilder(list).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseStringEx(String value) {\n        if (value == null) {\n            return null;\n        }\n        return new StringBuilder(value).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideEx(int value, int nums) {\n        if (nums == 0) {\n            throw new IllegalArgumentException(\"nums must not be zero\");\n        }\n        return (double) value / nums;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> nums, List<Integer> str) {\n        if (nums == null || str == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> value = new ArrayList<>(nums.size() + str.size());\n        int i = 0, j = 0;\n        while (i < nums.size() && j < str.size()) {\n            if (nums.get(i) <= str.get(j)) {\n                value.add(nums.get(i++));\n            } else {\n                value.add(str.get(j++));\n            }\n        }\n        while (i < nums.size()) {\n            value.add(nums.get(i++));\n        }\n        while (j < str.size()) {\n            value.add(str.get(j++));\n        }\n        return value;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedEx(List<Integer> list, List<Integer> n) {\n        if (list == null || n == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> input = new ArrayList<>(list.size() + n.size());\n        int i = 0, j = 0;\n        while (i < list.size() && j < n.size()) {\n            if (list.get(i) <= n.get(j)) {\n                input.add(list.get(i++));\n            } else {\n                input.add(n.get(j++));\n            }\n        }\n        while (i < list.size()) {\n            input.add(list.get(i++));\n        }\n        while (j < n.size()) {\n            input.add(n.get(j++));\n        }\n        return input;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_new(List<Integer> nums, List<Integer> str) {\n        if (nums == null || str == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> str = new ArrayList<>(nums.size() + str.size());\n        int i = 0, j = 0;\n        while (i < nums.size() && j < str.size()) {\n            if (nums.get(i) <= str.get(j)) {\n                str.add(nums.get(i++));\n            } else {\n                str.add(str.get(j++));\n            }\n        }\n        while (i < nums.size()) {\n            str.add(nums.get(i++));\n        }\n        while (j < str.size()) {\n            str.add(str.get(j++));\n        }\n        return str;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedHelper(List<Integer> list, List<Integer> nums) {\n        if (list == null || nums == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> str = new ArrayList<>(list.size() + nums.size());\n        int i = 0, j = 0;\n        while (i < list.size() && j < nums.size()) {\n            if (list.get(i) <= nums.get(j)) {\n                str.add(list.get(i++));\n            } else {\n                str.add(nums.get(j++));\n            }\n        }\n        while (i < list.size()) {\n            str.add(list.get(i++));\n        }\n        while (j < nums.size()) {\n            str.add(nums.get(j++));\n        }\n        return str;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_v2(List<Integer> str, List<Integer> n) {\n        if (str == null || n == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> value = new ArrayList<>(str.size() + n.size());\n        int i = 0, j = 0;\n        while (i < str.size() && j < n.size()) {\n            if (str.get(i) <= n.get(j)) {\n                value.add(str.get(i++));\n            } else {\n                value.add(n.get(j++));\n            }\n        }\n        while (i < str.size()) {\n            value.add(str.get(i++));\n        }\n        while (j < n.size()) {\n            value.add(n.get(j++));\n        }\n        return value;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that parses an integer from a string safely using try-catch.", "input": "", "output": "public class Utils {\n\n    public static int parseIntSafeEx(String str) {\n        try {\n            return Integer.parseInt(str);\n        } catch (NumberFormatException e) {\n            System.err.println(\"Invalid number format: \" + str);\n            return 0;\n        }\n    }\n}", "language": "java", "category": "exception-handling", "difficulty": "medium"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseStringEx(String text) {\n        if (text == null) {\n            return null;\n        }\n        return new StringBuilder(text).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideHelper(int s, int str) {\n        if (str == 0) {\n            throw new IllegalArgumentException(\"str must not be zero\");\n        }\n        return (double) s / str;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedHelper(List<Integer> input, List<Integer> value) {\n        if (input == null || value == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> arr = new ArrayList<>(input.size() + value.size());\n        int i = 0, j = 0;\n        while (i < input.size() && j < value.size()) {\n            if (input.get(i) <= value.get(j)) {\n                arr.add(input.get(i++));\n            } else {\n                arr.add(value.get(j++));\n            }\n        }\n        while (i < input.size()) {\n            arr.add(input.get(i++));\n        }\n        while (j < value.size()) {\n            arr.add(value.get(j++));\n        }\n        return arr;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedHelper(List<Integer> s, List<Integer> str) {\n        if (s == null || str == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> nums = new ArrayList<>(s.size() + str.size());\n        int i = 0, j = 0;\n        while (i < s.size() && j < str.size()) {\n            if (s.get(i) <= str.get(j)) {\n                nums.add(s.get(i++));\n            } else {\n                nums.add(str.get(j++));\n            }\n        }\n        while (i < s.size()) {\n            nums.add(s.get(i++));\n        }\n        while (j < str.size()) {\n            nums.add(str.get(j++));\n        }\n        return nums;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> list, List<Integer> value) {\n        if (list == null || value == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> text = new ArrayList<>(list.size() + value.size());\n        int i = 0, j = 0;\n        while (i < list.size() && j < value.size()) {\n            if (list.get(i) <= value.get(j)) {\n                text.add(list.get(i++));\n            } else {\n                text.add(value.get(j++));\n            }\n        }\n        while (i < list.size()) {\n            text.add(list.get(i++));\n        }\n        while (j < value.size()) {\n            text.add(value.get(j++));\n        }\n        return text;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> arr, List<Integer> input) {\n        if (arr == null || input == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> list = new ArrayList<>(arr.size() + input.size());\n        int i = 0, j = 0;\n        while (i < arr.size() && j < input.size()) {\n            if (arr.get(i) <= input.get(j)) {\n                list.add(arr.get(i++));\n            } else {\n                list.add(input.get(j++));\n            }\n        }\n        while (i < arr.size()) {\n            list.add(arr.get(i++));\n        }\n        while (j < input.size()) {\n            list.add(input.get(j++));\n        }\n        return list;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels_alt(String input) {\n        if (input == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : input.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_new(List<Integer> value, List<Integer> s) {\n        if (value == null || s == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> value = new ArrayList<>(value.size() + s.size());\n        int i = 0, j = 0;\n        while (i < value.size() && j < s.size()) {\n            if (value.get(i) <= s.get(j)) {\n                value.add(value.get(i++));\n            } else {\n                value.add(s.get(j++));\n            }\n        }\n        while (i < value.size()) {\n            value.add(value.get(i++));\n        }\n        while (j < s.size()) {\n            value.add(s.get(j++));\n        }\n        return value;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> text, List<Integer> str) {\n        if (text == null || str == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> str = new ArrayList<>(text.size() + str.size());\n        int i = 0, j = 0;\n        while (i < text.size() && j < str.size()) {\n            if (text.get(i) <= str.get(j)) {\n                str.add(text.get(i++));\n            } else {\n                str.add(str.get(j++));\n            }\n        }\n        while (i < text.size()) {\n            str.add(text.get(i++));\n        }\n        while (j < str.size()) {\n            str.add(str.get(j++));\n        }\n        return str;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowelsHelper(String value) {\n        if (value == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : value.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> str, List<Integer> text) {\n        if (str == null || text == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> arr = new ArrayList<>(str.size() + text.size());\n        int i = 0, j = 0;\n        while (i < str.size() && j < text.size()) {\n            if (str.get(i) <= text.get(j)) {\n                arr.add(str.get(i++));\n            } else {\n                arr.add(text.get(j++));\n            }\n        }\n        while (i < str.size()) {\n            arr.add(str.get(i++));\n        }\n        while (j < text.size()) {\n            arr.add(text.get(j++));\n        }\n        return arr;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> s, List<Integer> n) {\n        if (s == null || n == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> input = new ArrayList<>(s.size() + n.size());\n        int i = 0, j = 0;\n        while (i < s.size() && j < n.size()) {\n            if (s.get(i) <= n.get(j)) {\n                input.add(s.get(i++));\n            } else {\n                input.add(n.get(j++));\n            }\n        }\n        while (i < s.size()) {\n            input.add(s.get(i++));\n        }\n        while (j < n.size()) {\n            input.add(n.get(j++));\n        }\n        return input;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> str, List<Integer> arr) {\n        if (str == null || arr == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> str = new ArrayList<>(str.size() + arr.size());\n        int i = 0, j = 0;\n        while (i < str.size() && j < arr.size()) {\n            if (str.get(i) <= arr.get(j)) {\n                str.add(str.get(i++));\n            } else {\n                str.add(arr.get(j++));\n            }\n        }\n        while (i < str.size()) {\n            str.add(str.get(i++));\n        }\n        while (j < arr.size()) {\n            str.add(arr.get(j++));\n        }\n        return str;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideEx(int text, int nums) {\n        if (nums == 0) {\n            throw new IllegalArgumentException(\"nums must not be zero\");\n        }\n        return (double) text / nums;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int list, int str) {\n        if (str == 0) {\n            throw new IllegalArgumentException(\"str must not be zero\");\n        }\n        return (double) list / str;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_v2(List<Integer> s, List<Integer> text) {\n        if (s == null || text == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> str = new ArrayList<>(s.size() + text.size());\n        int i = 0, j = 0;\n        while (i < s.size() && j < text.size()) {\n            if (s.get(i) <= text.get(j)) {\n                str.add(s.get(i++));\n            } else {\n                str.add(text.get(j++));\n            }\n        }\n        while (i < s.size()) {\n            str.add(s.get(i++));\n        }\n        while (j < text.size()) {\n            str.add(text.get(j++));\n        }\n        return str;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> s, List<Integer> arr) {\n        if (s == null || arr == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> value = new ArrayList<>(s.size() + arr.size());\n        int i = 0, j = 0;\n        while (i < s.size() && j < arr.size()) {\n            if (s.get(i) <= arr.get(j)) {\n                value.add(s.get(i++));\n            } else {\n                value.add(arr.get(j++));\n            }\n        }\n        while (i < s.size()) {\n            value.add(s.get(i++));\n        }\n        while (j < arr.size()) {\n            value.add(arr.get(j++));\n        }\n        return value;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedHelper(List<Integer> input, List<Integer> arr) {\n        if (input == null || arr == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> value = new ArrayList<>(input.size() + arr.size());\n        int i = 0, j = 0;\n        while (i < input.size() && j < arr.size()) {\n            if (input.get(i) <= arr.get(j)) {\n                value.add(input.get(i++));\n            } else {\n                value.add(arr.get(j++));\n            }\n        }\n        while (i < input.size()) {\n            value.add(input.get(i++));\n        }\n        while (j < arr.size()) {\n            value.add(arr.get(j++));\n        }\n        return value;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideHelper(int text, int input) {\n        if (input == 0) {\n            throw new IllegalArgumentException(\"input must not be zero\");\n        }\n        return (double) text / input;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_new(int text, int list) {\n        if (list == 0) {\n            throw new IllegalArgumentException(\"list must not be zero\");\n        }\n        return (double) text / list;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowelsEx(String n) {\n        if (n == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : n.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int maxEx(int[] list) {\n        if (list == null || list.length == 0) {\n            throw new IllegalArgumentException(\"list must not be null or empty\");\n        }\n        int max = list[0];\n        for (int v : list) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> arr, List<Integer> arr) {\n        if (arr == null || arr == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> str = new ArrayList<>(arr.size() + arr.size());\n        int i = 0, j = 0;\n        while (i < arr.size() && j < arr.size()) {\n            if (arr.get(i) <= arr.get(j)) {\n                str.add(arr.get(i++));\n            } else {\n                str.add(arr.get(j++));\n            }\n        }\n        while (i < arr.size()) {\n            str.add(arr.get(i++));\n        }\n        while (j < arr.size()) {\n            str.add(arr.get(j++));\n        }\n        return str;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_new(List<Integer> s, List<Integer> value) {\n        if (s == null || value == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> s = new ArrayList<>(s.size() + value.size());\n        int i = 0, j = 0;\n        while (i < s.size() && j < value.size()) {\n            if (s.get(i) <= value.get(j)) {\n                s.add(s.get(i++));\n            } else {\n                s.add(value.get(j++));\n            }\n        }\n        while (i < s.size()) {\n            s.add(s.get(i++));\n        }\n        while (j < value.size()) {\n            s.add(value.get(j++));\n        }\n        return s;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_v2(List<Integer> input, List<Integer> value) {\n        if (input == null || value == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> text = new ArrayList<>(input.size() + value.size());\n        int i = 0, j = 0;\n        while (i < input.size() && j < value.size()) {\n            if (input.get(i) <= value.get(j)) {\n                text.add(input.get(i++));\n            } else {\n                text.add(value.get(j++));\n            }\n        }\n        while (i < input.size()) {\n            text.add(input.get(i++));\n        }\n        while (j < value.size()) {\n            text.add(value.get(j++));\n        }\n        return text;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedEx(List<Integer> value, List<Integer> s) {\n        if (value == null || s == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> n = new ArrayList<>(value.size() + s.size());\n        int i = 0, j = 0;\n        while (i < value.size() && j < s.size()) {\n            if (value.get(i) <= s.get(j)) {\n                n.add(value.get(i++));\n            } else {\n                n.add(s.get(j++));\n            }\n        }\n        while (i < value.size()) {\n            n.add(value.get(i++));\n        }\n        while (j < s.size()) {\n            n.add(s.get(j++));\n        }\n        return n;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> list, List<Integer> text) {\n        if (list == null || text == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> arr = new ArrayList<>(list.size() + text.size());\n        int i = 0, j = 0;\n        while (i < list.size() && j < text.size()) {\n            if (list.get(i) <= text.get(j)) {\n                arr.add(list.get(i++));\n            } else {\n                arr.add(text.get(j++));\n            }\n        }\n        while (i < list.size()) {\n            arr.add(list.get(i++));\n        }\n        while (j < text.size()) {\n            arr.add(text.get(j++));\n        }\n        return arr;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> arr, List<Integer> input) {\n        if (arr == null || input == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> list = new ArrayList<>(arr.size() + input.size());\n        int i = 0, j = 0;\n        while (i < arr.size() && j < input.size()) {\n            if (arr.get(i) <= input.get(j)) {\n                list.add(arr.get(i++));\n            } else {\n                list.add(input.get(j++));\n            }\n        }\n        while (i < arr.size()) {\n            list.add(arr.get(i++));\n        }\n        while (j < input.size()) {\n            list.add(input.get(j++));\n        }\n        return list;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedHelper(List<Integer> nums, List<Integer> value) {\n        if (nums == null || value == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> value = new ArrayList<>(nums.size() + value.size());\n        int i = 0, j = 0;\n        while (i < nums.size() && j < value.size()) {\n            if (nums.get(i) <= value.get(j)) {\n                value.add(nums.get(i++));\n            } else {\n                value.add(value.get(j++));\n            }\n        }\n        while (i < nums.size()) {\n            value.add(nums.get(i++));\n        }\n        while (j < value.size()) {\n            value.add(value.get(j++));\n        }\n        return value;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedEx(List<Integer> value, List<Integer> list) {\n        if (value == null || list == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> text = new ArrayList<>(value.size() + list.size());\n        int i = 0, j = 0;\n        while (i < value.size() && j < list.size()) {\n            if (value.get(i) <= list.get(j)) {\n                text.add(value.get(i++));\n            } else {\n                text.add(list.get(j++));\n            }\n        }\n        while (i < value.size()) {\n            text.add(value.get(i++));\n        }\n        while (j < list.size()) {\n            text.add(list.get(j++));\n        }\n        return text;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_v2(List<Integer> n, List<Integer> str) {\n        if (n == null || str == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> s = new ArrayList<>(n.size() + str.size());\n        int i = 0, j = 0;\n        while (i < n.size() && j < str.size()) {\n            if (n.get(i) <= str.get(j)) {\n                s.add(n.get(i++));\n            } else {\n                s.add(str.get(j++));\n            }\n        }\n        while (i < n.size()) {\n            s.add(n.get(i++));\n        }\n        while (j < str.size()) {\n            s.add(str.get(j++));\n        }\n        return s;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> n, List<Integer> value) {\n        if (n == null || value == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> n = new ArrayList<>(n.size() + value.size());\n        int i = 0, j = 0;\n        while (i < n.size() && j < value.size()) {\n            if (n.get(i) <= value.get(j)) {\n                n.add(n.get(i++));\n            } else {\n                n.add(value.get(j++));\n            }\n        }\n        while (i < n.size()) {\n            n.add(n.get(i++));\n        }\n        while (j < value.size()) {\n            n.add(value.get(j++));\n        }\n        return n;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide(int input, int nums) {\n        if (nums == 0) {\n            throw new IllegalArgumentException(\"nums must not be zero\");\n        }\n        return (double) input / nums;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int n, int text) {\n        if (text == 0) {\n            throw new IllegalArgumentException(\"text must not be zero\");\n        }\n        return (double) n / text;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString(String nums) {\n        if (nums == null) {\n            return null;\n        }\n        return new StringBuilder(nums).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideEx(int list, int text) {\n        if (text == 0) {\n            throw new IllegalArgumentException(\"text must not be zero\");\n        }\n        return (double) list / text;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_alt(int s, int nums) {\n        if (nums == 0) {\n            throw new IllegalArgumentException(\"nums must not be zero\");\n        }\n        return (double) s / nums;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels_new(String value) {\n        if (value == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : value.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide(int str, int arr) {\n        if (arr == 0) {\n            throw new IllegalArgumentException(\"arr must not be zero\");\n        }\n        return (double) str / arr;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedEx(List<Integer> arr, List<Integer> str) {\n        if (arr == null || str == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> s = new ArrayList<>(arr.size() + str.size());\n        int i = 0, j = 0;\n        while (i < arr.size() && j < str.size()) {\n            if (arr.get(i) <= str.get(j)) {\n                s.add(arr.get(i++));\n            } else {\n                s.add(str.get(j++));\n            }\n        }\n        while (i < arr.size()) {\n            s.add(arr.get(i++));\n        }\n        while (j < str.size()) {\n            s.add(str.get(j++));\n        }\n        return s;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_new(List<Integer> text, List<Integer> n) {\n        if (text == null || n == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> str = new ArrayList<>(text.size() + n.size());\n        int i = 0, j = 0;\n        while (i < text.size() && j < n.size()) {\n            if (text.get(i) <= n.get(j)) {\n                str.add(text.get(i++));\n            } else {\n                str.add(n.get(j++));\n            }\n        }\n        while (i < text.size()) {\n            str.add(text.get(i++));\n        }\n        while (j < n.size()) {\n            str.add(n.get(j++));\n        }\n        return str;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedHelper(List<Integer> arr, List<Integer> list) {\n        if (arr == null || list == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> str = new ArrayList<>(arr.size() + list.size());\n        int i = 0, j = 0;\n        while (i < arr.size() && j < list.size()) {\n            if (arr.get(i) <= list.get(j)) {\n                str.add(arr.get(i++));\n            } else {\n                str.add(list.get(j++));\n            }\n        }\n        while (i < arr.size()) {\n            str.add(arr.get(i++));\n        }\n        while (j < list.size()) {\n            str.add(list.get(j++));\n        }\n        return str;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Complete the following Java method so it returns the maximum value in an array.", "input": "", "output": "public class ArrayUtils {\n\n    public static int max(int[] n) {\n        if (n == null || n.length == 0) {\n            throw new IllegalArgumentException(\"n must not be null or empty\");\n        }\n        int max = n[0];\n        for (int v : n) {\n            if (v > max) {\n                max = v;\n            }\n        }\n        return max;\n    }\n}", "language": "java", "category": "completion", "difficulty": "easy"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString_v2(String text) {\n        if (text == null) {\n            return null;\n        }\n        return new StringBuilder(text).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide(int value, int text) {\n        if (text == 0) {\n            throw new IllegalArgumentException(\"text must not be zero\");\n        }\n        return (double) value / text;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime_new(int value) {\n        if (value < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= value; i++) {\n            if (value % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide(int str, int str) {\n        if (str == 0) {\n            throw new IllegalArgumentException(\"str must not be zero\");\n        }\n        return (double) str / str;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that counts the number of vowels in a string.", "input": "", "output": "public class StringUtils {\n\n    public static int countVowels_v2(String n) {\n        if (n == null) {\n            return 0;\n        }\n        int count = 0;\n        for (char c : n.toLowerCase().toCharArray()) {\n            if (\"aeiou\".indexOf(c) >= 0) {\n                count++;\n            }\n        }\n        return count;\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_new(int input, int n) {\n        if (n == 0) {\n            throw new IllegalArgumentException(\"n must not be zero\");\n        }\n        return (double) input / n;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_v2(List<Integer> str, List<Integer> arr) {\n        if (str == null || arr == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> n = new ArrayList<>(str.size() + arr.size());\n        int i = 0, j = 0;\n        while (i < str.size() && j < arr.size()) {\n            if (str.get(i) <= arr.get(j)) {\n                n.add(str.get(i++));\n            } else {\n                n.add(arr.get(j++));\n            }\n        }\n        while (i < str.size()) {\n            n.add(str.get(i++));\n        }\n        while (j < arr.size()) {\n            n.add(arr.get(j++));\n        }\n        return n;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_v2(List<Integer> input, List<Integer> text) {\n        if (input == null || text == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> s = new ArrayList<>(input.size() + text.size());\n        int i = 0, j = 0;\n        while (i < input.size() && j < text.size()) {\n            if (input.get(i) <= text.get(j)) {\n                s.add(input.get(i++));\n            } else {\n                s.add(text.get(j++));\n            }\n        }\n        while (i < input.size()) {\n            s.add(input.get(i++));\n        }\n        while (j < text.size()) {\n            s.add(text.get(j++));\n        }\n        return s;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_v2(List<Integer> list, List<Integer> arr) {\n        if (list == null || arr == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> n = new ArrayList<>(list.size() + arr.size());\n        int i = 0, j = 0;\n        while (i < list.size() && j < arr.size()) {\n            if (list.get(i) <= arr.get(j)) {\n                n.add(list.get(i++));\n            } else {\n                n.add(arr.get(j++));\n            }\n        }\n        while (i < list.size()) {\n            n.add(list.get(i++));\n        }\n        while (j < arr.size()) {\n            n.add(arr.get(j++));\n        }\n        return n;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideHelper(int nums, int arr) {\n        if (arr == 0) {\n            throw new IllegalArgumentException(\"arr must not be zero\");\n        }\n        return (double) nums / arr;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrimeHelper(int str) {\n        if (str < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= str; i++) {\n            if (str % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that checks whether a number is prime.", "input": "", "output": "public class MathUtils {\n\n    public static boolean isPrime_alt(int list) {\n        if (list < 2) {\n            return false;\n        }\n        for (int i = 2; i * i <= list; i++) {\n            if (list % i == 0) {\n                return false;\n            }\n        }\n        return true;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideHelper(int str, int input) {\n        if (input == 0) {\n            throw new IllegalArgumentException(\"input must not be zero\");\n        }\n        return (double) str / input;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSortedEx(List<Integer> value, List<Integer> nums) {\n        if (value == null || nums == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> list = new ArrayList<>(value.size() + nums.size());\n        int i = 0, j = 0;\n        while (i < value.size() && j < nums.size()) {\n            if (value.get(i) <= nums.get(j)) {\n                list.add(value.get(i++));\n            } else {\n                list.add(nums.get(j++));\n            }\n        }\n        while (i < value.size()) {\n            list.add(value.get(i++));\n        }\n        while (j < nums.size()) {\n            list.add(nums.get(j++));\n        }\n        return list;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that reverses a string.", "input": "", "output": "public class StringUtils {\n\n    public static String reverseString_v2(String n) {\n        if (n == null) {\n            return null;\n        }\n        return new StringBuilder(n).reverse().toString();\n    }\n}", "language": "java", "category": "function", "difficulty": "easy"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide(int arr, int text) {\n        if (text == 0) {\n            throw new IllegalArgumentException(\"text must not be zero\");\n        }\n        return (double) arr / text;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> input, List<Integer> nums) {\n        if (input == null || nums == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> nums = new ArrayList<>(input.size() + nums.size());\n        int i = 0, j = 0;\n        while (i < input.size() && j < nums.size()) {\n            if (input.get(i) <= nums.get(j)) {\n                nums.add(input.get(i++));\n            } else {\n                nums.add(nums.get(j++));\n            }\n        }\n        while (i < input.size()) {\n            nums.add(input.get(i++));\n        }\n        while (j < nums.size()) {\n            nums.add(nums.get(j++));\n        }\n        return nums;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted(List<Integer> str, List<Integer> str) {\n        if (str == null || str == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> nums = new ArrayList<>(str.size() + str.size());\n        int i = 0, j = 0;\n        while (i < str.size() && j < str.size()) {\n            if (str.get(i) <= str.get(j)) {\n                nums.add(str.get(i++));\n            } else {\n                nums.add(str.get(j++));\n            }\n        }\n        while (i < str.size()) {\n            nums.add(str.get(i++));\n        }\n        while (j < str.size()) {\n            nums.add(str.get(j++));\n        }\n        return nums;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divideHelper(int list, int arr) {\n        if (arr == 0) {\n            throw new IllegalArgumentException(\"arr must not be zero\");\n        }\n        return (double) list / arr;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_new(List<Integer> str, List<Integer> nums) {\n        if (str == null || nums == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> str = new ArrayList<>(str.size() + nums.size());\n        int i = 0, j = 0;\n        while (i < str.size() && j < nums.size()) {\n            if (str.get(i) <= nums.get(j)) {\n                str.add(str.get(i++));\n            } else {\n                str.add(nums.get(j++));\n            }\n        }\n        while (i < str.size()) {\n            str.add(str.get(i++));\n        }\n        while (j < nums.size()) {\n            str.add(nums.get(j++));\n        }\n        return str;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_new(List<Integer> str, List<Integer> arr) {\n        if (str == null || arr == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> nums = new ArrayList<>(str.size() + arr.size());\n        int i = 0, j = 0;\n        while (i < str.size() && j < arr.size()) {\n            if (str.get(i) <= arr.get(j)) {\n                nums.add(str.get(i++));\n            } else {\n                nums.add(arr.get(j++));\n            }\n        }\n        while (i < str.size()) {\n            nums.add(str.get(i++));\n        }\n        while (j < arr.size()) {\n            nums.add(arr.get(j++));\n        }\n        return nums;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}
{"instruction": "Fix the following Java method so it avoids division by zero.", "input": "", "output": "public class MathUtils {\n\n    public static double divide_new(int input, int value) {\n        if (value == 0) {\n            throw new IllegalArgumentException(\"value must not be zero\");\n        }\n        return (double) input / value;\n    }\n}", "language": "java", "category": "bug-fix", "difficulty": "easy"}
{"instruction": "Write a Java method that merges two sorted lists of integers into a new sorted list.", "input": "", "output": "import java.util.ArrayList;\nimport java.util.List;\n\npublic class CollectionUtils {\n\n    public static List<Integer> mergeSorted_alt(List<Integer> text, List<Integer> str) {\n        if (text == null || str == null) {\n            throw new IllegalArgumentException(\"lists must not be null\");\n        }\n        List<Integer> nums = new ArrayList<>(text.size() + str.size());\n        int i = 0, j = 0;\n        while (i < text.size() && j < str.size()) {\n            if (text.get(i) <= str.get(j)) {\n                nums.add(text.get(i++));\n            } else {\n                nums.add(str.get(j++));\n            }\n        }\n        while (i < text.size()) {\n            nums.add(text.get(i++));\n        }\n        while (j < str.size()) {\n            nums.add(str.get(j++));\n        }\n        return nums;\n    }\n}", "language": "java", "category": "function", "difficulty": "medium"}