GUI_多级菜单案例

╰半橙微兮° 2022-06-18 08:23 243阅读 0赞

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);
    	}
    }