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Reverse a String in Java - Multiple Ways

Learn how to reverse a string in Java using StringBuilder, character array and recursion.

Last updated: 11 January 2026

Method 1: Using StringBuilder

Using built-in reverse() method.

Main.javaRun in Compiler →
public class ReverseString {
    public static void main(String[] args) {
        String str = "Hello World";
        // StringBuilder is mutable
        StringBuilder sb = new StringBuilder(str);
        
        sb.reverse();
        
        System.out.println("Reversed String: " + sb.toString());
    }
}
Output:
Reversed String: dlroW olleH

Explanation

StringBuilder class provides a reverse() method to reverse the characters.

Method 2: Using char array

Manually reversing characters.

Main.javaRun in Compiler →
public class ReverseString {
    public static void main(String[] args) {
        String str = "Hello";
        char[] chars = str.toCharArray();
        
        for (int i = 0; i < chars.length / 2; i++) {
            char temp = chars[i];
            chars[i] = chars[chars.length - 1 - i];
            chars[chars.length - 1 - i] = temp;
        }
        
        System.out.println(new String(chars));
    }
}
Output:
olleH

Explanation

Convert to char array, swap start and end characters moving inward.

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