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     @Override38     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 }