《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.*;
				
				public class Test extends JFrame {
					public Test() {
						final JMenuBar mb = new JMenuBar();
						final JMenu fileMenu = new JMenu("File");
						JMenuItem exitItem = new JMenuItem("Exit");
				
						fileMenu.add("New ...");
						fileMenu.add("Open ...");
						fileMenu.add("Save");
						fileMenu.add("Save As ..");
						fileMenu.addSeparator();
						fileMenu.add(exitItem);
				
						mb.add(new JLabel(
									new ImageIcon("smiley_face_small.gif")));
				
						mb.add(fileMenu);
				
						// Either one of the following two lines will 
						// attach the menu bar to the application
						//setJMenuBar(mb);
						getRootPane().setJMenuBar(mb);
				
						exitItem.addActionListener(new ActionListener() {
							public void actionPerformed(ActionEvent e) {
								dispose();
								System.exit(0);
							}
						});
						System.out.println("component count:  " + 
										   mb.getComponentCount());
						System.out.println("first component: " + 
							(mb.getComponentAtIndex(0)).getClass().getName());
				
						System.out.println("menu count: " + (mb.getMenuCount()));
				
						JMenu menu = mb.getMenu(0);
						if(menu == null) System.out.println("null menu");
						else 			 System.out.println("got menu");
					}
				 	public static void main(String args[]) {
						GJApp.launch(new Test(), 
									"A Menu Bar",300,300,300,250); 
					}
				}
				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;
					}
				}