[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();  }}