程序设计题：请使用委托实现信用卡用户定时还款功能
本题的应用场景解释：
用户有一张信用卡，信用卡有一个总额度；
每个月会有信用卡账单显示月消费总额，月消费总额是小于信用卡总额度的；
用户有若干储蓄卡，可选择某张储蓄卡进行还款；
还款是指从储蓄卡中划走信用卡的月消费总额到信用卡；
如果储蓄卡余额不足则还款动作不成功。
要求如下： ①必须使用委托
②事件的触发方式是每个月的到期还款日；
根据本题所需要的功能，这里需要实现信用卡类，储蓄卡类，委托类以及测试类。
信用卡类我们需要设置信用卡总额度，月消费总额，以及还款日期，根据需求设置get，set方法。
public class CreditCard //信用卡类
{
private int totalAmount = 10000; //总额度
private int totalMonthlyAmount; //月消费总额
private string repayDate; //还款日期
public string year = DateTime.Now.ToString("yyyy-MM-dd").Split('-')[0]; //当前年月日
public string month = DateTime.Now.ToString("yyyy-MM-dd").Split('-')[1];
public string day = "15";
public CreditCard()
{
Console.WriteLine("还款日期：" + month + "月" + day +"日");
}
public int gettotalMonthlyAmount()
{
return this.totalMonthlyAmount;
}
public void settotalMonthlyAmount()
{
Console.Write("本月消费：");
int totalMonthlyAmount = Convert.ToInt32(Console.ReadLine());
if (totalMonthlyAmount >= 0 && totalMonthlyAmount < totalAmount)
this.totalMonthlyAmount = totalMonthlyAmount;
else
Console.WriteLine("已超过信用卡总额度！");
}
public void setrepayDate()
{
Console.Write("当前日期：");
string repayDate = Console.ReadLine(); //注意此处输入格式为：例如四月十二则输入0412
this.repayDate = repayDate;
if (String.Equals(this.repayDate,(month+day)))
{
Console.WriteLine("当日可还款！");
}
else
{
Console.WriteLine("未到还款日期！");
System.Environment.Exit(0);
}
}
}
储蓄卡类
需要注意，其中的charge()方法与下面的委托payBackMoney()相关联，其参数列表与返回值类型需一致。
public class AccountCard //储蓄卡类
{
private int Balance; //储蓄卡余额
public int getBalance()
{
return this.Balance;
}
public void setBalance()
{
Console.Write("储蓄卡余额：");
int Balance = Convert.ToInt32(Console.ReadLine());
this.Balance = Balance;
}
public void reCharge(AccountCard accountcart)
{
int money = Convert.ToInt32(Console.ReadLine());
this.Balance += money;
Console.WriteLine("充值成功！当前余额："+ accountcart.getBalance());
}
public void charge(AccountCard accountcart, CreditCard creditcard)
{
if (accountcart.getBalance() > creditcard.gettotalMonthlyAmount())
{
this.Balance = accountcart.getBalance() - creditcard.gettotalMonthlyAmount();
Console.WriteLine("还款成功,余额 " + (this.Balance) +" 元");
}
else
{
Console.Write("余额不足，还款失败,请充值 ：");
reCharge(accountcart);
charge(accountcart, creditcard);
}
}
}
委托类
public class Delegate //委托事件类
{
public delegate void payBackMoney(AccountCard accountcart, CreditCard creditcard);
public event payBackMoney payBackMoneyEvent;
public void isPayTrue(AccountCard accountcart, CreditCard creditcard)
{
if (payBackMoneyEvent != null)
payBackMoneyEvent(accountcart, creditcard);
//payBackMoneyEvent?.Invoke(accountcart, creditcard); //简化
}
}
结合以上三个类，可以设计出一个功能较为简单的信用卡定期还款的功能。在还款日期上，还未能实现动态设置，仍需改进。
完整代码如下：
using System;
namespace Csharpwork1 {
public class Delegate //委托事件类
{
public delegate void payBackMoney(AccountCard accountcart, CreditCard creditcard);
public event payBackMoney payBackMoneyEvent;
public void isPayTrue(AccountCard accountcart, CreditCard creditcard)
{
if (payBackMoneyEvent != null)
payBackMoneyEvent(accountcart, creditcard);
//payBackMoneyEvent?.Invoke(accountcart, creditcard); //简化
}
}
public class CreditCard //信用卡类
{
private int totalAmount = 10000; //总额度
private int totalMonthlyAmount; //月消费总额
private string repayDate; //还款日期
public string year = DateTime.Now.ToString("yyyy-MM-dd").Split('-')[0]; //当前年月日
public string month = DateTime.Now.ToString("yyyy-MM-dd").Split('-')[1];
public string day = "15";
public CreditCard()
{
Console.WriteLine("还款日期：" + month + "月" + day +"日");
}
public int gettotalMonthlyAmount()
{
return this.totalMonthlyAmount;
}
public void settotalMonthlyAmount()
{
Console.Write("本月消费：");
int totalMonthlyAmount = Convert.ToInt32(Console.ReadLine());
if (totalMonthlyAmount >= 0 && totalMonthlyAmount < totalAmount)
this.totalMonthlyAmount = totalMonthlyAmount;
else
Console.WriteLine("已超过信用卡总额度！");
}
public void setrepayDate()
{
Console.Write("当前日期：");
string repayDate = Console.ReadLine(); //注意此处输入格式为：例如四月十二则输入0412
this.repayDate = repayDate;
if (String.Equals(this.repayDate,(month+day)))
{
Console.WriteLine("当日可还款！");
}
else
{
Console.WriteLine("未到还款日期！");
System.Environment.Exit(0);
}
}
}
public class AccountCard //储蓄卡类
{
private int Balance; //储蓄卡余额
public int getBalance()
{
return this.Balance;
}
public void setBalance()
{
Console.Write("储蓄卡余额：");
int Balance = Convert.ToInt32(Console.ReadLine());
this.Balance = Balance;
}
public void reCharge(AccountCard accountcart)
{
int money = Convert.ToInt32(Console.ReadLine());
this.Balance += money;
Console.WriteLine("充值成功！当前余额："+ accountcart.getBalance());
}
public void charge(AccountCard accountcart, CreditCard creditcard)
{
if (accountcart.getBalance() > creditcard.gettotalMonthlyAmount())
{
this.Balance = accountcart.getBalance() - creditcard.gettotalMonthlyAmount();
Console.WriteLine("还款成功,余额 " + (this.Balance) +" 元");
}
else
{
Console.Write("余额不足，还款失败,请充值 ：");
reCharge(accountcart);
charge(accountcart, creditcard);
}
}
}
public class Test //测试类
{
static void Main(string[] args)
{
Delegate dlg = new Delegate();
CreditCard creditcard = new CreditCard();
AccountCard accountcart = new AccountCard();
creditcard.setrepayDate();
accountcart.setBalance();
creditcard.settotalMonthlyAmount();
dlg.payBackMoneyEvent += new Delegate.payBackMoney(accountcart.charge);
dlg.isPayTrue(accountcart, creditcard);
Console.ReadKey();
}
}
}
运行测试结果：
GitHub - LaterCat/Csharpwork1Contribute to LaterCat/Csharpwork1 development by creating an account on GitHub.https://github.com/LaterCat/Csharpwork1
