java swing菜单例子

//: Menus.java
// A menu-building system; also demonstrates
// icons in labels and menu items.
package c13.swing;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Menus extends JPanel {
  static final Boolean
    bT = new Boolean(true), 
    bF = new Boolean(false);
  // Dummy class to create type identifiers:
  static class MType { MType(int i) {} };
  static final MType
    mi = new MType(1), // Normal menu item
    cb = new MType(2), // Checkbox menu item
    rb = new MType(3); // Radio button menu item
  JTextField t = new JTextField(10);
  JLabel l = new JLabel("Icon Selected", 
    Faces.faces[0], JLabel.CENTER);
  ActionListener a1 = new ActionListener() {
    public void actionPerformed(ActionEvent e) {
      t.setText(
        ((JMenuItem)e.getSource()).getText());
    }
  };
  ActionListener a2 = new ActionListener() {
    public void actionPerformed(ActionEvent e) {
      JMenuItem mi = (JMenuItem)e.getSource();
      l.setText(mi.getText());
      l.setIcon(mi.getIcon());
    }
  };
  // Store menu data as "resources":
  public Object[][] fileMenu = {
    // Menu name and accelerator:
    { "File", new Character(''F'') },
    // Name type accel listener enabled
    { "New", mi, new Character(''N''), a1, bT },
    { "Open", mi, new Character(''O''), a1, bT },
    { "Save", mi, new Character(''S''), a1, bF },
    { "Save As", mi, new Character(''A''), a1, bF},
    { null }, // Separator
    { "Exit", mi, new Character(''x''), a1, bT },
  };
  public Object[][] editMenu = {
    // Menu name:
    { "Edit", new Character(''E'') },
    // Name type accel listener enabled
    { "Cut", mi, new Character(''t''), a1, bT },
    { "Copy", mi, new Character(''C''), a1, bT },
    { "Paste", mi, new Character(''P''), a1, bT },
    { null }, // Separator
    { "Select All", mi,new Character(''l''),a1,bT},
  };
  public Object[][] helpMenu = {
    // Menu name:
    { "Help", new Character(''H'') },
    // Name type accel listener enabled
    { "Index", mi, new Character(''I''), a1, bT },
    { "Using help", mi,n

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