[javaSE] GUI（菜单）

菜单MenuBar Menu  MenuItem

调用Frame对象的setMenuBar()方法，设置菜单，参数：MenuBar对象

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();
    }

}