public abstract void Send(string message, Colleague colleague);
public override void Register(Colleague colleague)
{
colleague.SetMediator(this);
colleagues.Add(colleague);
}
public override void Send(string message, Colleague colleague)
{
colleagues.Where(a => a != colleague)
.ToList()
.ForEach((c) => c.HandleNotification(message));
}
public abstract void Register(Colleague colleague);
