事件处理

 1 package ccc;
 2 import java.awt.Color;
 3 import java.awt.event.ActionEvent;
 4 import java.awt.event.ActionListener;
 5 import javax.swing.*;
 6 public class niu extends JFrame {
 7     JFrame f;
 8     JPanel p;
 9     JButton b1;
10     JButton b2;
11     public niu(){
12         f =new JFrame();
13         p =new JPanel();
14         b1 = new JButton("改变位置");
15         b2 = new JButton("改变颜色");
16         p.setLayout(null);                                                          //流布局
17         b1.setBounds(150,150,100,30);
18         b2.setBounds(150,100,100,30);
19         f.setSize(350,350);
20         f.add(p);
21         p.add(b1);
22         p.add(b2);
23         b1.addActionListener(new b1Action());
24         b2.addActionListener(new b2Action());
25         f.setVisible(true);        
26     }
27     class b1Action implements ActionListener{
28         
29         public void actionPerformed(ActionEvent e) {
30             p.setBackground(Color.BLUE);
31     }
32 }
33     
34     class b2Action implements ActionListener{
35         
36         public void actionPerformed(ActionEvent e) {
37             b2.setBounds(90,40,100,30);
38     }
39     }
40     public static void main(String[] args){
41         
42         new niu();                                                                //调用函数
43     }
44     
45 }