// 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());
}
}