1 package com.sun;
2 import java.awt.*;
3 import javax.swing.*;
4 import java.awt.event.*;
5 public class Demo_1_1 extends JFrame implements ActionListener{
6
7 Mypanel mp;
8 public static void main(String[] args) {
9 // TODO Auto-generated method stub
10 Demo_1_1 demo1 = new Demo_1_1();
11
12 }
13 public Demo_1_1() {
14 mp = new Mypanel();
15 JButton jb1 = new JButton("Button");
16 JButton jb2 = new JButton("Button2");
17 jb1.addActionListener(this);
18 jb1.setActionCommand("kaishi");
19 jb2.addActionListener(this);
20 jb2.setActionCommand("jieshu");
21 this.add(mp);
22 this.add(jb1,BorderLayout.EAST);
23 this.add(jb2,BorderLayout.NORTH);
24 // TODO Auto-generated constructor stub
25 this.setTitle("demo");
26 this.setSize(300,300);
27 this.setLocation(40, 40);
28 this.setDefaultCloseOperation(EXIT_ON_CLOSE);
29 this.setVisible(true);
30 }
31 public void actionPerformed(ActionEvent e) {
32 // TODO Auto-generated method stub
33 if(e.getActionCommand().equals("kaishi")){
34 System.out.println("this is yes ");
35 mp.setBackground(Color.BLUE);
36
37 }else if(e.getActionCommand().equals("jieshu")) {
38 System.out.println("this is no ");
39 mp.setBackground(Color.BLACK);
40 }
41 }
42 }
43 class Mypanel extends JPanel{
44
45 public void paint(Graphics g){
46 super.paint(g);
47 g.fillRect(0, 0, 300, 300);
48 g.setColor(Color.YELLOW);
49 g.fillRect(40, 40, 50, 50);
50 }
51 }
