多级菜单

/*
 * 多级菜单
 */
public class FrameDemo {
	public static void main(String[] args) {
		// 创建窗体对象并设置属性
		final Frame f = new Frame("多级菜单");
		f.setBounds(400, 200, 400, 300);
		f.setLayout(new FlowLayout());
		
		final String name = f.getTitle();

		// 创建菜单栏
		MenuBar mb = new MenuBar();
		// 创建菜单
		Menu m1 = new Menu("文件");
		Menu m2 = new Menu("更改名称");
		// 创建菜单项
		final MenuItem mi1 = new MenuItem("好好学习");
		final MenuItem mi2 = new MenuItem("天天向上");
		MenuItem mi3 = new MenuItem("恢复标题");
		MenuItem mi4 = new MenuItem("打开记事本");
		MenuItem mi5 = new MenuItem("退出系统");

		// 谁添加谁呢
		m2.add(mi1);
		m2.add(mi2);
		m2.add(mi3);
		
		m1.add(m2);
		m1.add(mi4);
		m1.add(mi5);
		
		mb.add(m1);

		// 设置菜单栏
		f.setMenuBar(mb);

		// 设置窗体关闭
		f.addWindowListener(new WindowAdapter() {
			@Override
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
		
		mi1.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				f.setTitle(mi1.getLabel());
			}
		});
		
		mi2.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				f.setTitle(mi2.getLabel());
			}
		});
		
		mi3.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				f.setTitle(name);
			}
		});
		
		mi4.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				Runtime r = Runtime.getRuntime();
				try {
					r.exec("notepad");
				} catch (IOException e1) {
					e1.printStackTrace();
				}
			}
		});

		mi5.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				System.exit(0);
			}
		});

		// 设置窗体可见
		f.setVisible(true);
	}
}