《Java2图形设计卷II：Swing》配套光盘源码

				import java.awt.*;
				import java.awt.event.*;
				import java.beans.*;
				import javax.swing.*;
				
				public class Test extends JApplet
									implements PropertyChangeListener {
					JPanel jp = new JPanel();
					JPanel cp = new JPanel();  // cp = checkbox panel
				
					JCheckBox jc = new JCheckBox("action enabled");
					JMenuBar mb = new JMenuBar(); 
					JToolBar tb = new JToolBar();
				
					Action saveAction = new SaveAction();
					Action exitAction = new ExitAction();
				
					public void init() {
						JMenu fileMenu = new JMenu("File");
				
						fileMenu.add(saveAction);
						fileMenu.add(exitAction);
						tb.add(saveAction);
				
						JCheckBoxMenuItem checkBoxItem = 
										  new JCheckBoxMenuItem("saved");
				
						associateActionAndCheckBoxItem(saveAction, checkBoxItem);
						fileMenu.add(checkBoxItem);
				
						mb.add(fileMenu);
				
						saveAction.addPropertyChangeListener(this);
				
						jp.setLayout(new BorderLayout(2,2));
						jp.add(tb, "North");  // toolbar
						jp.add(cp, "Center"); // checkbox panel
				
						cp.setLayout(new FlowLayout());
						cp.add(jc);
				
						Container contentPane = getContentPane();
				
						contentPane.setLayout(new BorderLayout());
						getRootPane().setJMenuBar(mb);
						contentPane.add(jp, "Center");
				
						jc.setSelected(saveAction.isEnabled());
				
						jc.addItemListener(new ItemListener() {
							public void itemStateChanged(ItemEvent event) {
								saveAction.setEnabled(!saveAction.isEnabled());
							}
						});
					}
					public void propertyChange(PropertyChangeEvent e) {
						boolean b = ((Boolean)e.getNewValue()).booleanValue();
						showStatus("save action " + (b ? "enabled" : "disabled"));
					}
					private void associateActionAndCheckBoxItem(
												final Action action,
												final JCheckBoxMenuItem item) {
						item.setHorizontalTextPosition(JButton.LEFT);
						item.setVerticalTextPosition(JButton.CENTER);
						item.setEnabled(action.isEnabled());
						item.addActionListener(action);
						action.addPropertyChangeListener(
													new PropertyChangeListener() {
							public void propertyChange(PropertyChangeEvent e) {
								String name = e.getPropertyName();
				
								if(name.equals(Action.NAME)) {
									item.setText((String)e.getNewValue());
									item.revalidate();
								}
								else if(name.equals("enabled")) {
									item.setEnabled(
										((Boolean)e.getNewValue()).booleanValue());
									item.repaint();
								}
								else if(name.equals(Action.SMALL_ICON)) {
									item.setIcon((Icon)e.getNewValue());
									item.revalidate();
								}
							}
						});
					}
				}
				class SaveAction extends AbstractAction {
					public SaveAction() {
						super("save", new ImageIcon("save.gif"));
						setEnabled(false);
					}
					public void actionPerformed(ActionEvent event) {
						String s = new String();
						Object o = event.getSource();
				
						if(o instanceof JButton) 		s += "ToolBar:  ";
						else if(o instanceof JMenuItem) s += "MenuBar:  ";
				
						System.out.println(s + " save");
					}
				}
				class ExitAction extends AbstractAction {
					public ExitAction() {
						super("exit");
					}
					public void actionPerformed(ActionEvent event) {
						System.exit(0);
					}
				}