JDK8/Java8源码在线阅读

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 * 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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package java.awt.event;

/**
 * An abstract adapter class for receiving component events.
 * The methods in this class are empty. This class exists as
 * convenience for creating listener objects.
 * <P>
 * Extend this class to create a <code>ComponentEvent</code> listener
 * and override the methods for the events of interest. (If you implement the
 * <code>ComponentListener</code> interface, you have to define all of
 * the methods in it. This abstract class defines null methods for them
 * all, so you can only have to define methods for events you care about.)
 * <P>
 * Create a listener object using your class and then register it with a
 * component using the component's <code>addComponentListener</code>
 * method. When the component's size, location, or visibility
 * changes, the relevant method in the listener object is invoked,
 * and the <code>ComponentEvent</code> is passed to it.
 *
 * @see ComponentEvent
 * @see ComponentListener
 * @see <a href="https://docs.oracle.com/javase/tutorial/uiswing/events/componentlistener.html">Tutorial: Writing a Component Listener</a>
 *
 * @author Carl Quinn
 * @since 1.1
 */
public abstract class ComponentAdapter implements ComponentListener {
    /**
     * Invoked when the component's size changes.
     */
    public void componentResized(ComponentEvent e) {}

    /**
     * Invoked when the component's position changes.
     */

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