GUI_多级菜单案例

package cn.itcast_09;

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;

/*
 * 多级菜单
 */
public class FrameDemo {
  public static void main(String[] args) {
    // 创建窗体对象设置属性及布局
    final Frame f = new Frame("多级菜单");
    f.setBounds(400, 200, 400, 300);
    f.setLayout(new FlowLayout());
    final String name = f.getTitle();

    // 创建菜单栏
    MenuBar mb = new MenuBar();
    // 创建菜单
    Menu m1 = new Menu("文件");
    // 创建二级菜单
    Menu m2 = new Menu("更改名称");
    // 创建菜单项
    final MenuItem mi1 = new MenuItem("好好学习");
    final MenuItem mi2 = new MenuItem("天天向上");
    final 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");

    // 添加菜单组件
    m2.add(mi1);
    m2.add(mi2);
    m2.add(mi3);

    m1.add(m2);
    m1.add(mi4);
    m1.add(mi5);

    mb.add(m1);
    f.setMenuBar(mb);

    // 设置关闭窗体
    f.addWindowListener(new WindowAdapter() {
      @Override
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });

    // 好好学习
    mi1.addActionListener(new ActionListener() {

      @Override
      public void actionPerformed(ActionEvent e) {
        f.setTitle(mi1.getLabel());
      }
    });

    // 天天向上
    mi2.addActionListener(new ActionListener() {

      @Override
      public void actionPerformed(ActionEvent e) {
        f.setTitle(mi2.getLabel());
      }
    });

    // 恢复标题
    mi3.addActionListener(new ActionListener() {

      @Override
      public void actionPerformed(ActionEvent e) {
        f.setTitle(name);
      }

    });

    // 打开记事本
    mi4.addActionListener(new ActionListener() {

      @Override
      public void actionPerformed(ActionEvent e) {
        Runtime r = Runtime.getRuntime();
        try {
          r.exec("notepad");
        } catch (IOException e1) {
          e1.printStackTrace();
        }
      }
    });

    // 退出系统并闭记事本
    mi5.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        Runtime r = Runtime.getRuntime();
        try {
          r.exec("taskkill /f /im notepad.exe");
        } catch (IOException e1) {
          e1.printStackTrace();
        }
        System.exit(0);
      }
    });

    // 设置窗体可见
    f.setVisible(true);
  }
}