e5_ppp.java

java 初学者学习实例

import java.awt.*;
import java.awt.event.*;

 
public class E5_18 extends Frame  implements ActionListener
{
	Button b=null;PopupMenu  menu;
	E5_18()
    {
    	super("带弹出菜单的窗口");
    	menu = new PopupMenu("我是弹出式菜单，是Menu的子类");
    	menu.add(new MenuItem("copy"));
    	menu.add(new MenuItem("paste"));
    	menu.add(new MenuItem("save"));
    	add(menu);
    	b = new Button("ok");add(b,"North");
    	b.addActionListener(this);
    	setSize(200,200);setVisible(true);
    }
    public void actionPerformed(ActionEvent e)
    {
    	menu.show(b,20,5);
    
    }
    public static void main(String args[])
    {
  	new E5_18();
    }
}