Here you can find the source of reverse(String input)
public static String reverse(String input)
//package com.java2s; public class Main { public static String reverse(String input) { StringBuilder output = new StringBuilder(); for (int i = input.length() - 1; i >= 0; i--) { output.append(input.charAt(i)); }//w ww.ja v a 2 s .c o m return output.toString(); } }