《Java2图形设计卷II：Swing》配套光盘源码

				import javax.swing.*;
				import java.awt.*;
				import java.awt.event.*;
				import java.util.*;
				import java.beans.*;
				
				public class Test extends JFrame {
					JTree tree = new JTree();
				
					public Test() {
						Container contentPane = getContentPane();
						JScrollPane scrollPane = new JScrollPane(tree);
				
						contentPane.add(new ControlPanel(), BorderLayout.NORTH);
						contentPane.add(scrollPane, BorderLayout.CENTER);
				
						tree.addPropertyChangeListener(new PropertyListener());
					}
					class ControlPanel extends JPanel {
						JCheckBox showRoot = new JCheckBox("show root node");
				
						public ControlPanel() {
							showRoot.setSelected(tree.isRootVisible());
				
							setLayout(new FlowLayout());
							add(showRoot);
				
							showRoot.addActionListener(new ActionListener() {
								public void actionPerformed(ActionEvent e) {
									tree.setRootVisible(showRoot.isSelected());	
								}
							});
						}
					}
					class PropertyListener implements PropertyChangeListener {
						public void propertyChange(PropertyChangeEvent e) {
							String name = e.getPropertyName();
				
							if(name.equals(JTree.ROOT_VISIBLE_PROPERTY)) {
								String msg = "Root Visible Property: " +
											  e.getNewValue().toString();
				
								JOptionPane.showMessageDialog(
									Test.this, 					// parent comp
									msg,						// message	
									"Property Change", 			// title
									JOptionPane.INFORMATION_MESSAGE);
							}
						}
					}
					public static void main(String args[]) {
						GJApp.launch(new Test(), 
									"Model Property Changes",300,300,450,300);
					}
				}
				class GJApp extends WindowAdapter {
					static private JPanel statusArea = new JPanel();
					static private JLabel status = new JLabel(" ");
					static private ResourceBundle resources;
				
					public static void launch(final JFrame f, String title,
											  final int x, final int y, 
											  final int w, int h) {
						launch(f,title,x,y,w,h,null);	
					}
					public static void launch(final JFrame f, String title,
											  final int x, final int y, 
											  final int w, int h,
											  String propertiesFilename) {
						f.setTitle(title);
						f.setBounds(x,y,w,h);
						f.setVisible(true);
				
						statusArea.setBorder(BorderFactory.createEtchedBorder());
						statusArea.setLayout(new FlowLayout(FlowLayout.LEFT,0,0));
						statusArea.add(status);
						status.setHorizontalAlignment(JLabel.LEFT);
				
						f.setDefaultCloseOperation(
											WindowConstants.DISPOSE_ON_CLOSE);
				
						if(propertiesFilename != null) {
							resources = ResourceBundle.getBundle(
										propertiesFilename, Locale.getDefault());
						}
				
						f.addWindowListener(new WindowAdapter() {
							public void windowClosed(WindowEvent e) {
								System.exit(0);
							}
						});
					}
					static public JPanel getStatusArea() {
						return statusArea;
					}
					static public void showStatus(String s) {
						status.setText(s);
					}
					static Object getResource(String key) {
						if(resources != null) {
							return resources.getString(key);
						}
						return null;
					}
				}