javaswing做菜单栏.docVIP

用eclipse开发的一个简单菜单窗口，源代码如下：import java.awt.*;import java.awt.event.*;import javax.swing.*;public class MenuTest public static void main(String args) MenuJFrame menu = new MenuJFrame();menu.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);menu.setVisible(true);class MenuJFrame extends JFrame private final int Width = 480;private final int Height = 640;private Action saveAction ;private Action saveAsAction;public MenuJFrame()setSize(Width,Height);JMenu File = new JMenu(file); JMenuItem open = File.add(new TestAction(open);open.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,InputEvent.CTRL_MASK);File.addSeparator();saveAction = new TestAction(save);JMenuItem save = File.add(saveAction); File.addSeparator(); saveAsAction = new TestAction(saveAs);JMenuItem saveAs = File.add(saveAsAction); File.addSeparator(); File.add(new AbstractAction(exit) public void actionPerformed(ActionEvent e) System.exit(0);); JMenu Edit = new JMenu(Edit); Action cut = new TestAction(cut); cut.putValue(Action.SMALL_ICON, new ImageIcon(cut.gif); Action copy = new TestAction(copy); cut.putValue(Action.SMALL_ICON, new ImageIcon(copy.gif); Action paste = new TestAction(paste); cut.putValue(Action.SMALL_ICON, new ImageIcon(copy.gif); Edit.add(cut); Edit.add(copy); Edit.add(paste); JMenu option = new JMenu(option); final JCheckBoxMenuItem ReadOnly = new JCheckBoxMenuItem(Read-Only); ReadOnly.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) boolean control = !(ReadOnly.isSelected(); saveAction.setEnabled(control); saveAsAction.setEnabled(control); ); ButtonGroup group = new ButtonGroup(); JRadioButtonMenuItem Insert = new JRadioButtonMenuItem(Insert); Insert.setSelected(true); JRadioButtonMenuItem OverType = new JRadioButtonMenuItem(OverType); group.add(Insert); group.add(OverType); JMenu Option = new JMenu(Option); Option.add(ReadOnly); Option.addSeparator(); Option.add(Insert); Option.add(OverType); Edit.addSeparator(); Edit.add(Option); JMenu Help = new JMenu(Help); Help.setMnemonic(H); JMenuItem Index = new JMenuItem(Index); Index.setMnemonic(I); Help.add(Index); Action AboutAction = new TestAction(AboutAction); AboutAction.putValue(Action.MNEMONIC_KEY,new Integer(A); Help.add(AboutAction); JMenuBar bar = new JMenuBar();setJMenuBar(bar);bar.add(File);bar.add(Edit);bar.add(Help);JPopupMenu popup = new JPopupMenu();popup.add(cut);popup.add(copy);popup.add(paste);JPanel panel = new JPanel();panel.setComponentPopupMenu(popup);add(panel);class TestAction extends AbstractAction public Tes