when the selected radio button is armed, pressed, selected, or released
import java.awt.GridLayout;
import javax.swing.AbstractButton;
import javax.swing.ButtonGroup;
import javax.swing.ButtonModel;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
public class JRadioButtonChangeListener {
public static void main(String args[]) {
JFrame frame = new JFrame("Grouping Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel(new GridLayout(0, 1));
ButtonGroup group = new ButtonGroup();
JRadioButton aRadioButton = new JRadioButton("A");
JRadioButton bRadioButton = new JRadioButton("B");
ChangeListener changeListener = new ChangeListener() {
public void stateChanged(ChangeEvent changEvent) {
AbstractButton aButton = (AbstractButton)changEvent.getSource();
ButtonModel aModel = aButton.getModel();
boolean armed = aModel.isArmed();
boolean pressed = aModel.isPressed();
boolean selected = aModel.isSelected();
System.out.println("Changed: " + armed + "/" + pressed + "/" +
selected);
}
};
panel.add(aRadioButton);
group.add(aRadioButton);
panel.add(bRadioButton);
group.add(bRadioButton);
aRadioButton.addChangeListener(changeListener);
bRadioButton.addChangeListener(changeListener);
frame.add(panel);
frame.setSize(300, 200);
frame.setVisible(true);
}
}