事件处理程序

 1 package com.wsy.work;
 2 
 3 import java.awt.Color;
 4 import java.awt.event.ActionEvent;
 5 import java.awt.event.ActionListener;
 6 
 7 import javax.swing.JButton;
 8 import javax.swing.JFrame;
 9 import javax.swing.JPanel;
10 
11 public class EventProcessing implements ActionListener{
12     JFrame jf;
13     JButton jb;
14     JPanel jp;
15     public EventProcessing() 
16     {
17         jf = new JFrame();
18         jb = new JButton("改变背景颜色");
19         jp = new JPanel();
20         jp.add(jb);
21         jp.setBackground(Color.BLUE);
22         jf.add(jp);
23         jf.setSize(300,300);
24         jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
25         jf.setVisible(true);
26         jf.setLocation(100,200);
27         jb.addActionListener(this);
28     }
29     @Override
30     public void actionPerformed(ActionEvent e) {
31         jp.setBackground(Color.PINK);
32     }
33     public static void main(String[] args) {
34         new EventProcessing();
35 
36     }
37 
38 
39 
40 }