Swing Menus and Toolbars - The Definitive Guide to Java Swing - page 189

JRadioButtonMenuItem threeMenuItem =
new JRadioButtonMenuItem("French Hens", threeIcon);
threeMenuItem.addItemListener(itemListener);
buttonGroup.add(threeMenuItem);
menu.add(threeMenuItem);
JRadioButtonMenuItem fourMenuItem =
new JRadioButtonMenuItem("Calling Birds", fourIcon, true);
fourMenuItem.addActionListener(actionListener);
buttonGroup.add(fourMenuItem);
menu.add(fourMenuItem);
JRadioButtonMenuItem fiveMenuItem =
new JRadioButtonMenuItem(fiveIcon);
fiveMenuItem.addActionListener(actionListener);
fiveMenuItem.setActionCommand("Rings");
buttonGroup.add(fiveMenuItem);
menu.add(fiveMenuItem);
JRadioButtonMenuItem sixMenuItem =
new JRadioButtonMenuItem(sixIcon, true);
sixMenuItem.addActionListener(actionListener);
sixMenuItem.setActionCommand("Geese");
buttonGroup.add(sixMenuItem);
menu.add(sixMenuItem);
menuBar.add(menu);
frame.setJMenuBar(menuBar);
frame.setSize(350, 250);
frame.setVisible(true);
}
};
EventQueue.invokeLater(runner);
}
}
■ Note Notice that the actionCommand property is set for those menu items lacking text labels. This allows
registered ActionListener objects to determine the selected object. This is only necessary when listeners
are shared across components.