//当基类和子类的类型不一致时,会提示“不一致的存取范围”
//Sample如下：
//只有在abstract前也加上public时候才能通过

//定义一个抽象类
abstract class CashSuper
{
    public abstract double acceptCash(double money);
}

//收费工厂
public class CashSuperFactory
{
    public static CashSuper createCashAccept(string type)
    {
        CashSuper cs = null;
        switch (type)
        {
            case "正常收费":
                cs = new CashNormal();
                break;
            case "打8折":
                CashRebate cr1 = new CashRebate("0.8");
                cs = cr1;
                break;
            case "满300送100":
                CashReturn cr2 = new CashReturn("300", "100");
                cs = cr2;
                break;
        }
        return cs;
    }
}