一、问题分析
委托实现信用卡用户定时还款功能
1. 使用C#的委托、事件功能
2.有储蓄卡类，信用卡类，委托还款，还款委托当作事件处理,委托类定义委托和事件以及自动还款方法
二、代码
using System;
//请使用委托实现信用卡用户定时还款功能
namespace LeeCodeText1
{
//信用卡类
class CreditCard
{
//还款金额
private int money;
//还款日
private string repaymentDate;
//还款金额的get，set方法
public void setMoney()
{
Console.Write("请输入本月需还款的金额:");
int money = Convert.ToInt32(Console.ReadLine());
this.money = money;
}
public int getMOney()
{
return money;
}
//还款日的get，set方法
public void setRepaymentDate()
{
Console.Write("还款日为:");
string repaymentDate = Console.ReadLine();
this.repaymentDate = repaymentDate;
}
public string getRepayment()
{
return repaymentDate;
}
//还款日还款方法
public void repayment(Bank bank, BankCard bankCard)
{
Console.WriteLine("今天是{0},还款日已到，此次需还款金额为 :{1}元，请还款。", this.repaymentDate, this.money);
int balance = bankCard.getBalance();
balance -= this.money;
bankCard.setBalance(balance);
while (balance < 0)
{
Console.WriteLine("对不起，当前余额为：{0}，余额不足，请充值！！！", balance);
bankCard.setBalance(bank);
balance = bankCard.getBalance();
}
Console.WriteLine("恭喜您，还款成功，余额还剩：{0}", balance);
}
}
//银行卡类
class BankCard
{
//银行卡余额
private int balance;
//银行卡余额的get，set方法
public void setBalance(Bank bank)
{
int add = bank.add();
this.balance += add;
}
public void setBalance(int banlance)
{
this.balance = banlance;
}
public int getBalance()
{
return balance;
}
}
//银行类
class Bank
{
//充值余额
public int add()
{
Console.Write("请输入充值金额:");
int addMoney = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("恭喜您，成功缴纳人民币{0}元，欢迎下次光临！", addMoney);
return addMoney;
}
}
class AutomaticPayment
{
//定义委托
public delegate void delegateAutomaticPayment(Bank bank, BankCard bancard);
//定义事件
public event delegateAutomaticPayment eventAutomaticPayment;
//调用事件委托
public void auto(Bank bank, BankCard bankCard)
{
if (eventAutomaticPayment != null)
{
eventAutomaticPayment(bank, bankCard);
}
}
}
class Program
{
static void Main(string[] args)
{
//委托对象
AutomaticPayment objDelegate = new AutomaticPayment();
//银行实例对象
Bank bank = new Bank();
//银行卡实例对象
BankCard bankCard = new BankCard();
//信用卡实例对象
CreditCard creditCard = new CreditCard();
//设置银行卡本钱
//bankCard.setBalance(bank);
//设置还款金额
creditCard.setMoney();
//设置还款日期
creditCard.setRepaymentDate();
//订阅事件,还款方法
objDelegate.eventAutomaticPayment += new AutomaticPayment.delegateAutomaticPayment(creditCard.repayment);
objDelegate.auto(bank, bankCard);
}
}
}
结果截图
代码源码：https://gitee.com/dark-blue-tree/code-assignment1/commit/1734540d518131d7cee09a7259fadc465cc4a6dd
