Swing Menus and Toolbars - The Definitive Guide to Java Swing - page 188

public static class ButtonItemListener implements ItemListener {
public void itemStateChanged(ItemEvent itemEvent) {
AbstractButton aButton = (AbstractButton)itemEvent.getSource();
int state = itemEvent.getStateChange();
String selected =
((state == ItemEvent.SELECTED) ? "selected" : "not selected");
System.out.println (aButton.getText() + " - selected? " + selected);
}
}
public static void main(String args[]) {
Runnable runner = new Runnable() {
public void run() {
final ActionListener actionListener = new ButtionActionListener();
final ItemListener itemListener = new ButtonItemListener();
JFrame frame = new JFrame("Radio Menu Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JMenuBar menuBar = new JMenuBar();
JMenu menu = new JMenu("Menu");
ButtonGroup buttonGroup = new ButtonGroup();
menu.setMnemonic(KeyEvent.VK_M);
JRadioButtonMenuItem emptyMenuItem =
new JRadioButtonMenuItem();
emptyMenuItem.setActionCommand("Empty");
emptyMenuItem.addActionListener(actionListener);
buttonGroup.add(emptyMenuItem);
menu.add(emptyMenuItem);
JRadioButtonMenuItem oneMenuItem =
new JRadioButtonMenuItem("Partridge");
oneMenuItem.addActionListener(actionListener);
buttonGroup.add(oneMenuItem);
menu.add(oneMenuItem);
JRadioButtonMenuItem twoMenuItem =
new JRadioButtonMenuItem("Turtle Doves", true);
twoMenuItem.addActionListener(actionListener);
buttonGroup.add(twoMenuItem);
menu.add(twoMenuItem);