// Demonstrate JRadioButton

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

/*

<applet code="JRadioButtonDemo" width=300 height=50>

</applet>

*/

public class JRadioButtonDemo extends JApplet

implements ActionListener {

JLabel jlab;

public void init() {

try {

SwingUtilities.invokeAndWait(

new Runnable() {

public void run() {

makeGUI();

}

}

);

} catch (Exception exc) {

System.out.println("Can't create because of " + exc);

}

}

private void makeGUI() {

// Change to flow layout.

setLayout(new FlowLayout());

// Create radio buttons and add them to content pane.

JRadioButton b1 = new JRadioButton("A");

b1.addActionListener(this);

add(b1);

JRadioButton b2 = new JRadioButton("B");

b2.addActionListener(this);

add(b2);

JRadioButton b3 = new JRadioButton("C");

b3.addActionListener(this);

add(b3);

// Define a button group.

ButtonGroup bg = new ButtonGroup();

bg.add(b1);

bg.add(b2);

bg.add(b3);

// Create a label and add it to the content pane.

jlab = new JLabel("Select One");

add(jlab);

}

// Handle button selection.

public void actionPerformed(ActionEvent ae) {

jlab.setText("You selected " + ae.getActionCommand());

}

}