《Java2图形设计卷II：Swing》配套光盘源码

				import javax.swing.*;
				import java.util.*;
				import java.awt.*;
				import java.awt.event.*;
				import java.beans.*;
				
				public class ClientPropertiesTest extends JApplet {
					JButton button = new JButton("toggle target color");
					JComboBox targetCombo = new JComboBox();
					JPanel[] targets = { 	new JPanel(),
											new JPanel(),
											new JPanel() 	};
					public void init() {
						Container contentPane = getContentPane();
						Dimension targetPreferredSize = new Dimension(100,100);
						JPanel targetPanel = new JPanel();
				
						for(int i=0; i < targets.length; ++i) {
							targets[i].setBackground(Color.blue);
							targets[i].setPreferredSize(targetPreferredSize);
							targetPanel.add(targets[i]);
				
						}
						targetCombo.addItem("left");
						targetCombo.addItem("center");
						targetCombo.addItem("right");
				
						contentPane.setLayout(new FlowLayout());
						contentPane.add(button);
						contentPane.add(targetCombo);
						contentPane.add(targetPanel);
				
						button.putClientProperty("target", targets[0]);
				
						button.addActionListener(new ActionListener() {
							public void actionPerformed(ActionEvent e) {
								Component c = 
									(Component)button.getClientProperty("target");
				
								if(c != null) {
									Color bg = c.getBackground();
				
									c.setBackground(bg == Color.blue ?
													Color.red : Color.blue);
				
									c.repaint();
								}
							}
						});
						targetCombo.addActionListener(new ActionListener() {
							public void actionPerformed(ActionEvent e) {
								button.putClientProperty(
									"target", 
									targets[targetCombo.getSelectedIndex()]);
							}
						});
						button.addPropertyChangeListener(
													new PropertyChangeListener() {
							public void propertyChange(PropertyChangeEvent e) {
								if(e.getPropertyName().equals("target")) {
									showStatus(
										(String)targetCombo.getSelectedItem() + 
										" panel set as target");
								}
							}
						});
					}
					public static void main(String args[]) {
						final JFrame f = new JFrame();
						JApplet applet = new ClientPropertiesTest();
				
						applet.init();
				
						f.setContentPane(applet.getContentPane());
						f.setBounds(100,100,300,250);
						f.setTitle("ClientPropertiesTest");
						f.setVisible(true);
				
						f.addWindowListener(new WindowAdapter() {
							public void windowClosing(WindowEvent e) {
								f.dispose();
								System.exit(0);
							}
						});
					}
				}