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

public class MenuBarDemo {
    private Frame frame;
     MenuBar menuBar;
     Menu menu;
     Menu subMenu;
     MenuItem menuItem;

    public MenuBarDemo() {
        init();
        addEvents();
    }

    void init() {
        frame = new Frame("菜单测试");
        frame.setBounds(300,200,500,400);
        frame.setLayout(new FlowLayout());
        // 菜单栏
        menuBar =  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);

    }

     addEvents(){
        frame.addWindowListener( WindowAdapter() {
            @Override
             windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        菜单点击
        menuItem.addActionListener( ActionListener() {
            @Override
             actionPerformed(ActionEvent e) {
                System.exit(0);
            }
        });
    }

    /**
     * @param args
     */
    static  main(String[] args) {
         MenuBarDemo();
    }

}