java swing AncestorListener 使用示例，,package cn.o

java swing AncestorListener 使用示例，,package cn.o

package cn.outofmemory.snippets.desktop;import java.awt.BorderLayout;import java.awt.Container;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.util.Timer;import java.util.TimerTask;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.event.AncestorEvent;import javax.swing.event.AncestorListener;public class Ancestor {    public static void main(String args[]) {        final JFrame jFrame = new JFrame();        Container cPane = jFrame.getContentPane();        JButton jButton = new JButton("Hide for 5 seconds!");        ActionListener actListener = new ActionListener() {            @Override            public void actionPerformed(ActionEvent event) {                jFrame.setVisible(false);                TimerTask schedule = new TimerTask() {                    @Override                    public void run() {                        jFrame.setVisible(true);                    }                };                Timer timer = new Timer();                timer.schedule(schedule, 5000);            }        };        jButton.addActionListener(actListener);        AncestorListener ancestorListener = new AncestorListener() {            @Override            public void ancestorAdded(AncestorEvent event) {                System.out.println("Added");                dumpInfo(event);            }            @Override            public void ancestorMoved(AncestorEvent event) {                System.out.println("Moved");                dumpInfo(event);            }            @Override            public void ancestorRemoved(AncestorEvent event ){                System.out.println("Removed");                dumpInfo(event);            }            private void dumpInfo(AncestorEvent event) {                System.out.println("   Ancestor: " + name(event.getAncestor()));                System.out.println("   AncestorParent: "                        + name(event.getAncestorParent()));                System.out.println("   Component: " + name(event.getComponent()));            }            private String name(Container container) {                return (container == null) ? null : container.getName();            }        };        jButton.addAncestorListener(ancestorListener);        cPane.add(jButton, BorderLayout.NORTH);        jFrame.setSize(500, 400);        jFrame.setVisible(true);    }}