Java tutorial
//package com.java2s; /* * This library is part of Geranium - * an open source UI library for GWT. * * Copyright (c) Alkacon Software GmbH (http://www.alkacon.com)- * * This library 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 library 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. * * For further information about Alkacon Software, please see the * company website: http://www.alkacon.com * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ import java.util.HashSet; import java.util.Set; public class Main { /** * Returns the intersection of two sets without modifying the original sets.<p> * * @param <A> the type of objects contained in the sets * * @param first the first set * @param second the second set * * @return the intersection of both sets */ public static <A> Set<A> intersection(Set<A> first, Set<A> second) { HashSet<A> result = new HashSet<A>(first); result.retainAll(second); return result; } }