public void Execute()
        {
            Console.WriteLine("请选择Iphone:1.Iphone5 2.Iphone6");
            string      str = Console.ReadLine();
            IphonePrice ip  = IphoneStoreFactory.CreateIphonePrice(str == "1" ? "Iphone5" : "Iphone6");

            ip.Price();
        }
        internal static IphonePrice CreateIphonePrice(string type)
        {
            IphonePrice ip = null;

            switch (type)
            {
            case "Iphone5":
                ip = new Iphone5Price();
                break;

            case "Iphone6":
                ip = new Iphone6Price();
                break;

            default:
                break;
            }
            if (ip == null)
            {
                throw new Exception();
            }
            return(ip);
        }