[javaSE] GUI（菜单）详解编程语言

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 MenuBarDemo { 
    private Frame frame; 
    private MenuBar menuBar; 
    private Menu menu; 
    private Menu subMenu; 
    private MenuItem menuItem; 
 
    public MenuBarDemo() { 
        init(); 
        addEvents(); 
    } 
 
    public void init() { 
        frame = new Frame("菜单测试"); 
        frame.setBounds(300, 200, 500, 400); 
        frame.setLayout(new FlowLayout()); 
        // 菜单栏 
        menuBar = new MenuBar(); 
        // 菜单 
        menu = new Menu("文件"); 
        // 菜单项 
        menuItem = new MenuItem("退出"); 
        // 菜单添加菜单项 
        menu.add(menuItem); 
        // 菜单栏添加菜单 
        menuBar.add(menu); 
        frame.setMenuBar(menuBar); 
 
        frame.setVisible(true); 
 
    } 
 
    public void addEvents(){ 
        frame.addWindowListener(new WindowAdapter() { 
            @Override 
            public void windowClosing(WindowEvent e) { 
                System.exit(0); 
            } 
        }); 
        //菜单点击 
        menuItem.addActionListener(new ActionListener() { 
            @Override 
            public void actionPerformed(ActionEvent e) { 
                System.exit(0); 
            } 
        }); 
    } 
 
    /** 
     * @param args 
     */ 
    public static void main(String[] args) { 
        new MenuBarDemo(); 
    } 
 
}