GUI——制作菜单

import java.awt.*;import java.awt.event.*;class MyMenuDemo {private Frame f;private MenuBar mb;private Menu m,subMenu;private MenuItem closeItem,subItem;MyMenuDemo(){init();}public void init(){f = new Frame("my window");f.setBounds(300,100,500,600);f.setLayout(new FlowLayout());mb = new MenuBar();m = new Menu("文件");subMenu = new Menu("子菜单");subItem = new MenuItem("子条目");closeItem = new MenuItem("退出");subMenu.add(subItem);m.add(subMenu);m.add(closeItem);mb.add(m);f.setMenuBar(mb);myEvent();f.setVisible(true);}private void myEvent(){closeItem.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){System.exit(0);}});f.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}});}public static void main(String[] args) {new MyMenuDemo();}}