java how to reverse a string

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

import java.util.*;

public class Lautturi {

	public static void main(String[] args) {

		String str = "Hello Java";

        String newStr = "";
        for(int i=str.length()-1;i>=0;i--)
        {
            newStr = newStr+str.charAt(i);
        }

		System.out.println(newStr);

	}
}

output:

avaJ olleH