多级菜单

来源：互联网发布：ios内存清理软件编辑：程序博客网时间：2024/05/16 18:22
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) {        // 创建窗体对象并设置属性        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");        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");        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");        // 谁添加谁呢        m2.add(mi1);        m2.add(mi2);        m2.add(mi3);        m1.add(m2);        m1.add(mi4);        m1.add(mi5);        mb.add(m1);        // 设置菜单栏        f.setMenuBar(mb);        // 设置窗体关闭        f.addWindowListener(new WindowAdapter() {            @Override            public void windowClosing(WindowEvent e) {                System.exit(0);            }        });        mi1.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent e) {                f.setTitle(mi1.getLabel());            }        });        mi2.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent e) {                f.setTitle(mi2.getLabel());            }        });        mi3.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent e) {                f.setTitle(name);            }        });        mi4.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent e) {                Runtime r = Runtime.getRuntime();                try {                    r.exec("notepad");                } catch (IOException e1) {                    e1.printStackTrace();                }            }        });        mi5.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent e) {                System.exit(0);            }        });        // 设置窗体可见        f.setVisible(true);    }}
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