如何查看maven setting

题目：

信用卡还款是银行系统的重要业务，业务流程说明如下：

1. 用户有信用卡和储蓄卡；储蓄卡有查询余额和取款功能，信用卡能够查看账单金额、查看还款日和查看余额三个功能；
2. 请使用委托与事件实现下列功能：用户可自由设置信用卡还款关联的储蓄卡，当还款日到期时进行账单金额的自动划扣；
3. 请注意事件主要是设计什么时候启动委托，委托的主要目的是设置还款的储蓄卡；
4. 为避免设计出现偏差，给出了部分功能代码，请在此基础上进行开发。

设计流程：首先将该程序分为四类，分别为储蓄卡类，信用卡类，委托类，主程序。再分别在各类中设计函数实现其功能。

关键代码：

class DepositCard
    {
        private string name;
        private int depositmoney;
        public DepositCard(string name, int depositmoney)
        {
            this.name = name;
            this.depositmoney = depositmoney;
        }
        public int getDepositMoney()
        {
            return this.depositmoney;
        }
        public void setDepositMoney(int money)
        {
            this.depositmoney = money;
        }
    }

功能说明：设计储蓄卡类，并设计储蓄卡的查询余额函数和设置余额函数。

class CreditCard
    {
        public string name;
        public int creditmoney;
        public int repaymentday;
        public DepositCard s;
        public CreditCard(string name, int creditmoney, int repaymentday, DepositCard s)
        {
            this.name = name;
            this.creditmoney = creditmoney;
            this.repaymentday = repaymentday;
            this.s = s;
        }
        public void repayment()
        {
            Console.WriteLine("{0}的储蓄卡余额为:{1}", this.name, this.s.getDepositMoney());
            s.setDepositMoney(this.s.getDepositMoney() + creditmoney);
            Console.WriteLine("已还款");
            Console.WriteLine("还款金额:{0}", this.creditmoney);
            Console.WriteLine("账户余额:{0}", s.getDepositMoney());
        }
        public void not()
        {
            Console.WriteLine("{0}的储蓄余额为:{1}", this.name, this.s.getDepositMoney());
            Console.WriteLine("未到还款日期");
        }
    }

功能说明：设计信用卡类，并设计读取余额、还款金额函数，考虑到有可能用户未到还款日期，再额外设定一个说明未到还款日期功能的函数。

class repaymentDelegate
    {
        public delegate void repayMent();
        public event repayMent Repay;
        public void notifRepay()
        {
            if (Repay != null)
            {
                Console.WriteLine("触发事件");
                Repay();
            }
        }
    }

功能说明：设计委托类

class Program
    {
        static void Main(string[] args)
        {
            DepositCard D1 = new DepositCard("x", 6000);
            DepositCard D2 = new DepositCard("y", 1000);
            DepositCard D3 = new DepositCard("z", 10000);
            CreditCard C1 = new CreditCard("x", -1000, 0, D1);
            CreditCard C2 = new CreditCard("y", -500, 1, D2);
            CreditCard C3 = new CreditCard("z", -8000, 0, D3);
            CreditCard[] CreditCards = new CreditCard[3];
            CreditCards[0] = C1;
            CreditCards[1] = C2;
            CreditCards[2] = C3;
            repaymentDelegate m = new repaymentDelegate();
            foreach (CreditCard C in CreditCards)
            {
                if (C.repaymentday == 0)
                    m.Repay += new repaymentDelegate.repayMent(C.repayment);
                else
                    m.Repay += new repaymentDelegate.repayMent(C.not);
            }
            m.notifRepay();
            Console.ReadKey();
        }
    }
}

功能说明：设计主函数，并对用户进行初始化。

运行结果截图：

完整代码：

namespace ConsoleApplication3delegate
{
    class DepositCard
    {
        private string name;
        private int depositmoney;
        public DepositCard(string name, int depositmoney)
        {
            this.name = name;
            this.depositmoney = depositmoney;
        }
        public int getDepositMoney()
        {
            return this.depositmoney;
        }
        public void setDepositMoney(int money)
        {
            this.depositmoney = money;
        }
    }
    class CreditCard
    {
        public string name;
        public int creditmoney;
        public int repaymentday;
        public DepositCard s;
        public CreditCard(string name, int creditmoney, int repaymentday, DepositCard s)
        {
            this.name = name;
            this.creditmoney = creditmoney;
            this.repaymentday = repaymentday;
            this.s = s;
        }
        public void repayment()
        {
            Console.WriteLine("{0}的储蓄卡余额为:{1}", this.name, this.s.getDepositMoney());
            s.setDepositMoney(this.s.getDepositMoney() + creditmoney);
            Console.WriteLine("已还款");
            Console.WriteLine("还款金额:{0}", this.creditmoney);
            Console.WriteLine("账户余额:{0}", s.getDepositMoney());
        }
        public void not()
        {
            Console.WriteLine("{0}的储蓄余额为:{1}", this.name, this.s.getDepositMoney());
            Console.WriteLine("未到还款日期");
        }
    }
    class repaymentDelegate
    {
        public delegate void repayMent();
        public event repayMent Repay;
        public void notifRepay()
        {
            if (Repay != null)
            {
                Console.WriteLine("触发事件");
                Repay();
            }
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            DepositCard D1 = new DepositCard("x", 6000);
            DepositCard D2 = new DepositCard("y", 1000);
            DepositCard D3 = new DepositCard("z", 10000);
            CreditCard C1 = new CreditCard("x", -1000, 0, D1);
            CreditCard C2 = new CreditCard("y", -500, 1, D2);
            CreditCard C3 = new CreditCard("z", -8000, 0, D3);
            CreditCard[] CreditCards = new CreditCard[3];
            CreditCards[0] = C1;
            CreditCards[1] = C2;
            CreditCards[2] = C3;
            repaymentDelegate m = new repaymentDelegate();
            foreach (CreditCard C in CreditCards)
            {
                if (C.repaymentday == 0)
                    m.Repay += new repaymentDelegate.repayMent(C.repayment);
                else
                    m.Repay += new repaymentDelegate.repayMent(C.not);
            }
            m.notifRepay();
            Console.ReadKey();
        }
    }
}

总结：通过此次实验，体会到委托与事件在程序设计中的重要性，对委托与事件的认识有了深一步了解：委托属于一个定义，是和类、接口类似的，通常放在外部。借助本次作业，更好的将委托与事件应用于实践。