how to reverse string in java

/**
 * @author lautturi.com
 * Java example: java reverse string
 */

import java.util.*;

public class Lautturi {

	public static void main(String[] args) {
		
		String se="HELLO";
		StringBuilder a=new StringBuilder(se);
		a.reverse();
		String rev=a.toString();
		System.out.println(rev);
		
	}
}

output:

OLLEH