//public Context(PayCash payCash, CashEnum Mode)
        public Context(CashEnum Mode)
        {
            //this.payCash = payCash;
            switch (Mode)
            {
            case CashEnum.normal:
                payCash = new CashNormal();
                break;

            case CashEnum.refund:
                payCash = new CashReturn("300", "100");
                break;

            case CashEnum.discount:
                payCash = new CashDiscount("0.8");
                break;

            default:
                break;
            }
        }
        public static PayCash createCashAccept(CashEnum cashEnum)
        {
            PayCash payCash = null;

            switch (cashEnum)
            {
            case CashEnum.normal:
                payCash = new CashNormal();
                break;

            case CashEnum.refund:
                payCash = new CashReturn("300", "100");
                break;

            case CashEnum.discount:
                payCash = new CashDiscount("0.8");
                break;

            default:
                break;
            }
            return(payCash);
        }