public void TestDemo()
        {
            IMobileFactory factory = new SamSungFactory();
            IMobile        mobile  = factory.Creator();

            mobile.Call();
            factory = new HuaWeiFactory();
            mobile  = factory.Creator();
            mobile.Call();
            factory = new IPhoneFactory();
            mobile  = factory.Creator();
            mobile.Call();
            Console.ReadKey();
        }