static void Main(string[] args)
        {
            //老板胡漢三
            Boss huhansan = new Boss();

            //看股票的同事
            StockObserver tongshi1 = new StockObserver("魏關奼", huhansan);
            //看NBA的同事
            NBAObserver tongshi2 = new NBAObserver("易管查", huhansan);

            huhansan.Update += new EventHandler(tongshi1.CloseStockMarket);
            huhansan.Update += new EventHandler(tongshi2.CloseNBADirectSeeding);

            //老闆回來
            huhansan.SubjectState = "我胡漢三回來了!";
            //發出通知
            huhansan.Notify();

            Console.Read();
        }
        static void Main(string[] args)
        {
            //老板胡漢三
            Boss huhansan = new Boss();

            //看股票的同事
            StockObserver tongshi1 = new StockObserver("魏關奼", huhansan);
            //看NBA的同事
            NBAObserver tongshi2 = new NBAObserver("易管查", huhansan);

            huhansan.Attach(tongshi1);
            huhansan.Attach(tongshi2);

            huhansan.Detach(tongshi1);

            //老闆回來
            huhansan.SubjectState = "我胡漢三回來了!";
            //發出通知
            huhansan.Notify();

            Console.Read();
        }