Here you can find the source of equals(final String target1, final String target2)
public static boolean equals(final String target1, final String target2)
//package com.java2s; /*/* ww w . j a va2 s . c o m*/ * Copyright 2004-2011 the Seasar Foundation and the Others. * * 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. */ public class Main { public static boolean equals(final String target1, final String target2) { return (target1 == null) ? (target2 == null) : target1 .equals(target2); } }