/**   DumbRobotOwner does something wrong.  Can you spot it?
 */
public class DumbRobotOwner 
{
   private Robot harry, sally;

   public DumbRobotOwner()
   {
      // creating harry and sally

      // create new wheels
      Stepper wheels = new Wheels();

      // create a new Robot using the new wheels, 
      // and the color pink, and refer to it as harry
      harry = new Robot( wheels, java.awt.Color.pink );

      // create sally with wheels too, but with the color blue
      sally = new Robot( wheels, java.awt.Color.blue );


      // switch both of them on.
      harry.switchOn();
      sally.switchOn();

      // Oh, I'm bored.  Sleep for a while.
      try {
         Thread.sleep( 30*60*1000 );  // sleep for 30 minutes.
      } catch ( InterruptedException e ) {
         System.out.println( "Hey! Who woke me up?!!" );
      }

      // oops! I forgot to turn them off before I slept!
      // better do it now.

      harry.switchOff();
      sally.switchOff();
   }
}