Reverse a string in java

/**
 * @author lautturi.com
 * Java example: Reverse a string in java
 */

import java.util.*;

public class Lautturi {

	public static void main(String[] args) {

		String str = "abcd";
		String newstr = str == null?null:new StringBuffer(str).reverse().toString();
	    System.out.print(newstr);

	}
}