JRadioButton

 1 public class SwingTest123 extends JFrame implements ActionListener {
 2
 3     JRadioButton boy, girl;
 4     JLabel mess;
 5     ButtonGroup group;
 6
 7     public SwingTest123() {
 8         init();
 9         setBounds(100, 200, 200, 200);
10         setVisible(true);
11     }
12
13     public void init() {
14         setLayout(null);
15         Container c = getContentPane();
16
17         boy = new JRadioButton("boy");
18         boy.setBounds(20, 50, 50, 35);
19         girl = new JRadioButton("girl");
20         girl.setBounds(100, 50, 50, 35);
21         mess = new JLabel("hello");
22         mess.setBounds(30, 100, 100, 25);
23
24         group = new ButtonGroup();
25         group.add(boy);
26         group.add(girl);
27         c.add(boy);
28         c.add(girl);
29         c.add(mess);
30         boy.addActionListener(this);
31         girl.addActionListener(this);
32
33     }
34
35     String radioText = null;
36
37     @Override
38     public void actionPerformed(ActionEvent e) {
39         if (e.getSource() == boy) {
40             radioText = boy.getText();
41
42             System.out.println(radioText);
43         } else if (e.getSource() == girl) {
44             radioText = girl.getText();
45             System.out.println(radioText);
46         }
47         mess.setText("You are a " + radioText);
48
49     }
50
51     public static void main(String[] args) {
52         SwingTest123 st = new SwingTest123();
53
54     }
55
56 }