public void undo() { if (previousSpeed == Fan.HIGH) { ceilingFan.High(); } else if (previousSpeed == Fan.MEDUIM) { ceilingFan.Meduim(); } else if (previousSpeed == Fan.LOW) { ceilingFan.Low(); } else if (previousSpeed == Fan.OFF) { ceilingFan.Off(); } }
public void execute() { previousSpeed = ceilingFan.GetSpeed(); ceilingFan.Meduim(); }