1 /* 2 * Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package java.awt.event; 27 28 /** 29 * An abstract adapter class for receiving container events. 30 * The methods in this class are empty. This class exists as 31 * convenience for creating listener objects. 32 * <P> 33 * Extend this class to create a {@code ContainerEvent} listener 34 * and override the methods for the events of interest. (If you implement the 35 * {@code ContainerListener} interface, you have to define all of 36 * the methods in it. This abstract class defines null methods for them 37 * all, so you can only have to define methods for events you care about.) 38 * <P> 39 * Create a listener object using the extended class and then register it with 40 * a component using the component's {@code addContainerListener} 41 * method. When the container's contents change because a component has 42 * been added or removed, the relevant method in the listener object is invoked, 43 * and the {@code ContainerEvent} is passed to it. 44 * 45 * @see ContainerEvent 46 * @see ContainerListener 47 * @see <a href="https://docs.oracle.com/javase/tutorial/uiswing/events/containerlistener.html">Tutorial: Writing a Container Listener</a> 48 * 49 * @author Amy Fowler 50 * @since 1.1 51 */ 52 public abstract class ContainerAdapter implements ContainerListener { 53 /** 54 * Invoked when a component has been added to the container. 55 */ 56 public void componentAdded(ContainerEvent e) {} 57 58 /** 59 * Invoked when a component has been removed from the container. 60 */ 61 public void componentRemoved(ContainerEvent e) {} 62 }