// Purpose.  JRadioButton demo

import javax.swing.*;
import java.awt.event.*;

public class JRadioButtonDemo {
   public static JPanel createRadioButtons( String[] choices ) {
      JPanel rPanel = new JPanel();
      Box radios = Box.createVerticalBox();
      rPanel.add( radios );

      ItemListener rbil = new ItemListener() {
         public void itemStateChanged( ItemEvent e ) {
            System.out.println( ((AbstractButton)e.getItem()).getText() + " is "
               + ((e.getStateChange() == ItemEvent.SELECTED) ? "on" : "off") );
         }
      };

      JRadioButton rb;
      ButtonGroup bg = new ButtonGroup();
      for (int i=0; i < choices.length; i++) {
         rb = new JRadioButton( choices[i] );
         radios.add( rb );
         rb.addItemListener( rbil );
         bg.add( rb );
      }
      return rPanel;
   }

   public static void main( String[] args ) {
      JFrame frame = new JFrame( "JRadioButton  demo" );
      frame.addWindowListener( new WindowAdapter() {
         public void windowClosing( WindowEvent e ) { System.exit( 0 ); } } );
      String[] choices = { "Alpha","Bravo","Charlie","Delta","Echo","Foxtrot" };
      frame.getContentPane().add( createRadioButtons( choices ) );
      frame.setSize( 300, 240 );
      frame.setVisible( true );
   }
}

// Delta is on
// Delta is off
// Bravo is on
// Bravo is off
// Foxtrot is on
// Foxtrot is on