Here you can find the source of reverse(String s)
public static String reverse(String s)
//package com.java2s; /*-------------------------------------------------------------------------+ | | | Copyright 2005-2011 The ConQAT Project | | | | Licensed under the Apache License, Version 2.0 (the "License"); | | you may not use this file except in compliance with the License. | | You may obtain a copy of the License at | | | | http://www.apache.org/licenses/LICENSE-2.0 | | | | Unless required by applicable law or agreed to in writing, software | | distributed under the License is distributed on an "AS IS" BASIS, | | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | | See the License for the specific language governing permissions and | | limitations under the License. | +-------------------------------------------------------------------------*/ import java.util.Iterator; import java.util.Map; public class Main { /** Line break. */ public static final String CR = System.getProperty("line.separator"); /** The empty string. */ public static final String EMPTY_STRING = ""; /** Reverse a string */ public static String reverse(String s) { return new StringBuilder(s).reverse().toString(); }//from w w w . j av a 2s . co m /** * Create string representation of a map. */ public static String toString(Map<?, ?> map) { return toString(map, EMPTY_STRING); } /** * Create string representation of a map. * * @param map * the map * @param indent * a line indent */ public static String toString(Map<?, ?> map, String indent) { StringBuilder result = new StringBuilder(); Iterator<?> keyIterator = map.keySet().iterator(); while (keyIterator.hasNext()) { result.append(indent); Object key = keyIterator.next(); result.append(key); result.append(" = "); result.append(map.get(key)); if (keyIterator.hasNext()) { result.append(CR); } } return result.toString(); } }