C#接口继承

public interface ICard
{
    //账户金额
    double Money { get; set; }
    //获取账户信息
    string GetCountInfo();
    //存钱
    void SaveMoney(double money);
    //取钱
    void CheckOutMoney(double money);
}

public class NHCard : ICard
{
    private double _money = 30.0;
    public double Money 
    { 
        get
        {
            return _money; 
        }
        set
        {
            _money=value;
        } 
    }
    public string GetCountInfo()
    {
        return "Bank Of NongHang";
    }
    public void SaveMoney(double money)
    {
        this.Money += money;
    }
    public void CheckOutMoney(double money)
    {
        this.Money -= money;
    }
}