Exemplo de RadioButtons em Java

 1import java.awt.BorderLayout;
 2import java.awt.GridLayout;
 3import java.awt.event.ActionEvent;
 4import java.awt.event.ActionListener;
 5import javax.swing.BorderFactory;
 6import javax.swing.ButtonGroup;
 7import javax.swing.JButton;
 8import javax.swing.JFrame;
 9import javax.swing.JPanel;
10import javax.swing.JRadioButton;
11
12public class Radio {
13	private JFrame janela;
14	private JRadioButton yesButton;
15	private JRadioButton noButton;
16	private JRadioButton maybeButton;
17	private JButton getButton;
18	private ButtonGroup bgroup;
19	
20	public Radio () {
21		janela = new JFrame("Teste de Radio Button");
22		janela.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
23		janela.setLayout(new BorderLayout());
24		
25		yesButton = new JRadioButton("Yes", true);
26		noButton = new JRadioButton("No", false);
27		maybeButton = new JRadioButton("Maybe", false);
28
29		bgroup = new ButtonGroup();
30		bgroup.add(yesButton);
31		bgroup.add(noButton);
32		bgroup.add(maybeButton);
33		
34		getButton = new JButton("Get");
35		getButton.addActionListener(new ActionListener() {
36			public void actionPerformed(ActionEvent arg0) {
37				String out = "Get";
38				if (yesButton.isSelected()) {
39					out = yesButton.getText();
40				} else if (noButton.isSelected()) {
41					out = noButton.getText();
42				} else if (maybeButton.isSelected()) {
43					out = maybeButton.getText();
44				}
45				getButton.setText(out);
46			}
47		});
48
49		JPanel radioPanel = new JPanel();
50		radioPanel.setLayout(new GridLayout(4, 1));
51		radioPanel.add(yesButton);
52		radioPanel.add(noButton);
53		radioPanel.add(maybeButton);
54		radioPanel.add(getButton);
55	
56		radioPanel.setBorder(BorderFactory.createTitledBorder(BorderFactory
57				.createEtchedBorder(), "Married?"));
58		janela.add(radioPanel);
59		janela.pack();
60		janela.setVisible(true);
61	}
62	
63	public static void main(String [] args) {
64		new Radio();
65	}
66}