e808. 建立菜单栏，菜单，菜单项

When the user selects a menu item, it fires an action event.

    // Create the menu bar
    JMenuBar menuBar = new JMenuBar();

    // Create a menu
    JMenu menu = new JMenu("Menu Label");
    menuBar.add(menu);

    // Create a menu item
    JMenuItem item = new JMenuItem("Item Label");
    item.addActionListener(actionListener);
    menu.add(item);

    // Install the menu bar in the frame
    frame.setJMenuBar(menuBar);

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