Java tutorial
//package com.java2s; /* * JBoss, Home of Professional Open Source. * Copyright 2008, Red Hat Middleware LLC, and individual contributors * as indicated by the @author tags. See the copyright.txt file in the * distribution for a full listing of individual contributors. * * This is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 2.1 of * the License, or (at your option) any later version. * * This software 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this software; if not, write to the Free * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA, or see the FSF site: http://www.fsf.org. */ import java.util.Collection; public class Main { /** * Adds all of the elements in the specified collection to the target collection if * a collection is specified. * * @param <E> * @param target * @param c collection containing elements to be added to this collection, may be null * @return <tt>true</tt> if this collection changed as a result of the call */ public static <E> boolean addAllIfSet(Collection<E> target, Collection<? extends E> c) { if (c == null) return false; return target.addAll(c); } }