Java二级

1package hello;
2import java.awt.*;
3import java.awt.event.*;
4import javax.swing.*;
5
6public class Hello extends JFrame{
7    
8    private JLabel lab;
9    private JCheckBox box1,box2;
10    
11    public  Hello(){
12        super("复选按钮");
13        setSize(300,300);
14        setLocation(300,300);
15        setLayout(new FlowLayout());
16        Container ban=getContentPane();
17        lab=new JLabel("you do not choose");
18        box1=new JCheckBox("zhu",false);
19        box2=new JCheckBox("laz",false);
20        ban.add(lab);
21        ban.add(box1);
22        ban.add(box2);
23        box1.addItemListener(new itemevent());
24        box2.addItemListener(new itemevent());
25        setVisible(true);
26    }
27    
28    public static void main(String args[])
29    {
30        Hello tt=new Hello();
31        tt.addWindowListener( new win());
32        
33    }
34    
35    class itemevent implements ItemListener{
36
37        @Override
38        public void itemStateChanged(ItemEvent e) {
39            // TODO Auto-generated method stub
40            if(e.getSource()==box1) {
41                if(e.getStateChange()==ItemEvent.SELECTED)
42                    lab.setText("you choose zhu");
43                else {
44                    lab.setText("you do not choose zhu");
45                }
46            }
47            if(e.getSource()==box2) {    
48                if(e.getStateChange()==ItemEvent.SELECTED) 
49                    lab.setText("you choose laz");
50                else {
51                    lab.setText("you do not choose zhu");
52                }
53            
54            }
55        }        
56    }
57    
58    static class win extends WindowAdapter{
59        public void windowClosing(WindowEvent e) {
60            System.exit(0);
61        }
62    }
63    
64}