.reverse()

The .reverse() method returns a modified StringBuilder object with its character sequence rearranged in the opposite order. This is the most straightforward way to reverse a string in Java.

myStringBuilder.reverse();

The .reverse() method takes no arguments.

The following example creates a StringBuilder with a specified String then uses the .reverse() method on it:

import java.util.*;

public class Example {
  public static void main(String[] args)
  {
    StringBuilder str = new StringBuilder("Hello World!");
    System.out.println(str.toString());
    str.reverse();
    System.out.println(str.toString());
  }
}

This produces the following output:

Hello World!
!dlroW olleH