public void notifyAll()
 {
     for (var i = 0; i < list.Count - 1; i++)
     {
         HelloWorld.Interfaces.INotify notify = list[i];
         notify.notified();
     }
 }
 public HelloObserver subscribe(HelloWorld.Interfaces.INotify observerable)
 {
     list.Add(observerable);
     return(this);
 }