Java一级菜单和多级菜单的创建

一级菜单： 

package GUI_test2;

import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.Menu;
import java.awt.MenuBar;
import java.awt.MenuItem;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class FrameDemo {

	public static void main(String[] args) {

		//创建窗体
		Frame f = new Frame("一级菜单");
		f.setBounds(400, 200, 400, 300);
		f.setLayout(new FlowLayout());
		
		//创建菜单栏
		MenuBar mb = new MenuBar();
		//创建菜单
		Menu m = new Menu("菜单");
		//创建菜单项
		MenuItem mi = new MenuItem("退出系统");
		
		m.add(mi);
		mb.add(m);
		
		//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);
			}
		});
		//添加事件
		mi.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent arg0) {
				System.exit(0);
			}
		});
			
		//显示窗体
		f.setVisible(true);
	}
}

 多级菜单：

package GUI_test2;

import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.Menu;
import java.awt.MenuBar;
import java.awt.MenuItem;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.IOException;

public class FrameDemo2 {
	public static void main(String[] args) {

		//创建窗体
		Frame f = new Frame("多级菜单");
		f.setBounds(400, 200, 400, 300);
		f.setLayout(new FlowLayout());
		
		String name = f.getTitle();
		
		//创建菜单栏
		MenuBar mb = new MenuBar();
		//创建菜单
		Menu m1 = new Menu("菜单");
		Menu m2 = new Menu("更改名称");
		
		//创建菜单项
		MenuItem mi1 = new MenuItem("好好学习");
		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");
		
		//添加
		m1.add(m2);
		m1.add(mi4);
		m1.add(mi5);
		m2.add(mi1);
		m2.add(mi2);
		m2.add(mi3);
		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);
			}
		});
		
		//添加事件
		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("天天向上");
				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 arg0) {
				Runtime r = Runtime.getRuntime();
				try {
					r.exec("notepad");
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				
			}
		});
		mi5.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent arg0) {
				System.exit(0);
			}
		});
			
		//显示窗体
		f.setVisible(true);
	}
}