Here you can find the source of areEqual(String s1, String s2)
private static boolean areEqual(String s1, String s2)
//package com.java2s; /* license-start//from w ww . j a v a2 s.c o m * * Copyright (C) 2008 - 2013 Crispico, <http://www.crispico.com/>. * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation version 3. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details, at <http://www.gnu.org/licenses/>. * * Contributors: * Crispico - Initial API and implementation * * license-end */ public class Main { private static boolean areEqual(String s1, String s2) { return s1 != null ? s1.equals(s2) : s2 == null; } }