// Purpose.  JCheckBox demo

import java.awt.*;        // GridLayout, FlowLayout
import java.awt.event.*;  // ItemListener, ItemEvent, WindowAdapter, WindowEvent
import javax.swing.*;     // JCheckBox, JPanel, JFrame

public class JCheckBoxDemo {
   public static JPanel createCheckBoxes( String[] choices ) {
      JPanel cPanel = new JPanel();
      cPanel.setLayout( new GridLayout( choices.length, 1 ) );

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

      JCheckBox cb;
      for (int i=0; i < choices.length; i++) {
         cb = new JCheckBox( choices[i] );
         cb.addItemListener( cbil );
         cPanel.add( cb );
      }
      return cPanel;
   }

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

// Alpha is on
// Bravo is on
// Charlie is on
// Bravo is off
// Alpha is off