// Purpose.  JButton and "anonymous inner class" demo

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

public class JButtonDemo {

   public static JPanel createButtons( String[] choices ) {
      JPanel buttons = new JPanel();

      ActionListener bl = new ActionListener() {
         public void actionPerformed( ActionEvent e ) {
            System.out.println( e.getActionCommand() );
         }
      };

      JButton b;
      for (int i=0; i < choices.length; i++) {
         b = new JButton( choices[i] );
         b.addActionListener( bl );
         buttons.add( b );
      }
      return buttons;
   }

   public static void main( String[] args ) {
      String[] choices = { "Alpha","Bravo","Charlie","Delta","Echo","Foxtrot" };
      JFrame frame = new JFrame( "JButton demo" );

      // 1. class definition 
      // class WL extends WindowAdapter {
      //    public void windowClosing( WindowEvent e ) {
      //       System.exit( 0 );
      // }  }
      // 2. object creation
      // WL wlObj = new WL();
      // 3. object registration
      // frame.addWindowListener( wlObj );

      // 1. class definition
      // class WL extends WindowAdapter {
      //    public void windowClosing( WindowEvent e ) {
      //       System.exit( 0 );
      // }  }
      // 2. object creation and object registration
      // frame.addWindowListener( new WL() );

      // 1. class definition, object creation, and object registration
      frame.addWindowListener(
         new WindowAdapter() {
            public void windowClosing( WindowEvent e ) {
               System.exit( 0 );
            }
         }
      );

      frame.getContentPane().add( createButtons( choices ) );

      frame.setSize( 300, 240 );
      frame.setVisible( true );
   }
}