public virtual void execute()
 {
     hottub.on();
     hottub.heat();
     hottub.bubblesOn();
 }
 public void undo()
 {
     hottub.On();
     hottub.heat();
     hottub.Off();
 }
 public void execute()
 {
     hottub.On();
     hottub.heat();
     hottub.bubblesOn();
 }
 public void undo()
 {
     hottub.heat();
     hottub.on();
 }