如何在Java中实现字符串反转

在Java中，有多种方法可以实现字符串反转

1. 使用StringBuilder类：

public class ReverseString {
    public static void main(String[] args) {
        String input = "Hello, World!";
        String reversed = reverse(input);
        System.out.println("Reversed string: " + reversed);
    }

    public static String reverse(String input) {
        StringBuilder sb = new StringBuilder(input);
        return sb.reverse().toString();
    }
}

2. 使用StringBuffer类：

public class ReverseString {
    public static void main(String[] args) {
        String input = "Hello, World!";
        String reversed = reverse(input);
        System.out.println("Reversed string: " + reversed);
    }

    public static String reverse(String input) {
        StringBuffer sb = new StringBuffer(input);
        return sb.reverse().toString();
    }
}

3. 使用for循环：

public class ReverseString {
    public static void main(String[] args) {
        String input = "Hello, World!";
        String reversed = reverse(input);
        System.out.println("Reversed string: " + reversed);
    }

    public static String reverse(String input) {
        char[] chars = input.toCharArray();
        int left = 0;
        int right = chars.length - 1;

        while (left < right) {
            char temp = chars[left];
            chars[left] = chars[right];
            chars[right] = temp;
            left++;
            right--;
        }

        return new String(chars);
    }
}

4. 使用递归：

public class ReverseString {
    public static void main(String[] args) {
        String input = "Hello, World!";
        String reversed = reverse(input);
        System.out.println("Reversed string: " + reversed);
    }

    public static String reverse(String input) {
        if (input == null || input.length() <= 1) {
            return input;
        }

        return reverse(input.substring(1)) + input.charAt(0);
    }
}

以上就是在Java中实现字符串反转的几种方法。你可以根据自己的需求和场景选择合适的方法。