JDK14/Java14源码在线阅读

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package java.awt.event;

import java.util.EventListener;

/**
 * The listener interface for receiving container events.
 * The class that is interested in processing a container event
 * either implements this interface (and all the methods it
 * contains) or extends the abstract {@code ContainerAdapter} class
 * (overriding only the methods of interest).
 * The listener object created from that class is then registered with a
 * component using the component's {@code addContainerListener}
 * method. When the container's contents change because a component
 * has been added or removed, the relevant method in the listener object
 * is invoked, and the {@code ContainerEvent} is passed to it.
 * <P>
 * Container events are provided for notification purposes ONLY;
 * The AWT will automatically handle add and remove operations
 * internally so the program works properly regardless of
 * whether the program registers a {@code ContainerListener} or not.
 *
 * @see ContainerAdapter
 * @see ContainerEvent
 * @see <a href="https://docs.oracle.com/javase/tutorial/uiswing/events/containerlistener.html">Tutorial: Writing a Container Listener</a>
 *
 * @author Tim Prinzing
 * @author Amy Fowler
 * @since 1.1
 */
public interface ContainerListener extends EventListener {
    /**
     * Invoked when a component has been added to the container.

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