C# 接口例题

希望通过此例题可以帮助你更好的理解接口的作用

我们创建一个银行接口，有存钱，取钱方法，还有账号余额属性，，，然后实现这个接口，，，

      using System;
      namespace InterfaceDemo
      {
      /// <summary>
      /// 定义一个银行接口
      /// </summary>
      interface IBankAccount
       {
      //存款
      void PayIn(decimal amout);
      //取款
      bool WithShowMySelf(decimal amout);
      //属性：账户余额
      decimal Balance { get; }
       }
      /// <summary>
      /// 银行账户，实现接口
      /// </summary>
      class SaverAccount : IBankAccount
       {
      private decimal balance;  //私有化余额
      public decimal Balance //只读金钱属性
       {
      get
       {
      return balance;
       }
       }
      public void PayIn(decimal amout) //存钱
       {
       balance += amout;
       }
      public bool WithShowMySelf(decimal amout)//取钱
       {
      if(balance >= amout)
       {
       balance -= amout;
      return true;
       }
      else
       {
       Console.WriteLine("银行余额不足，取款失败");
      return false;
       }
       }
       }
      class Program
       {
      static void Main(string[] args)
       {
       IBankAccount myAccount = new SaverAccount();
       myAccount.PayIn(1000);
       myAccount.WithShowMySelf(200);
       Console.WriteLine("余额：{0}",myAccount.Balance);
       Console.Read();
       }
       }
      }
  
 

      /// <summary>
      ///需要使用转账功能的接口
      /// </summary>
      interface ItranBack : IBankAccount
       {
      //继承的基础上，添加转账的方法
      bool TransferTo(IBankAccount destination, decimal amount);
       }
      class Transfer : ItranBack
       {
      private decimal balance;  //私有化余额
      public decimal Balance //只读金钱属性
       {
      get
       {
      return balance;
       }
       }
      public void PayIn(decimal amout) //存钱
       {
       balance += amout;
       }
      /// <summary>
      /// 转账方法
      /// </summary>
      /// <param name="destination">转账的人的账号</param>
      /// <param name="amount">转账金额</param>
      /// <returns></returns>
      public bool TransferTo(IBankAccount destination, decimal amount)
       {
      bool result = WithShowMySelf(amount);
      if(result == true)
       {
       destination.PayIn(amount);
       }
      return result;
       }
      public bool WithShowMySelf(decimal amout)//取钱
       {
      if (balance >= amout)
       {
       balance -= amout;
      return true;
       }
      else
       {
       Console.WriteLine("银行余额不足，取款失败");
      return false;
       }
       }
       }
      class Program
       {
      static void Main(string[] args)
       {
      //创建两个账号
       IBankAccount myAccount = new SaverAccount();
       ItranBack yourAccount = new Transfer();
      //可进行 存钱,取钱，，一系列操作，
       myAccount.WithShowMySelf(1000);
       myAccount.PayIn(1000);
       yourAccount.PayIn(100);
       Console.WriteLine("转账前：我卡里的余额：{0}", myAccount.Balance);
       Console.WriteLine("转账前：你卡里的余额：{0}", yourAccount.Balance);
       yourAccount.TransferTo(myAccount, 500); //转账
       Console.WriteLine("转账后：我卡里的余额：{0}", myAccount.Balance);
       Console.WriteLine("转账后：你卡里的余额：{0}", yourAccount.Balance);
       Console.Read();
       }
       }
      }
  
 

文章来源: czhenya.blog.csdn.net，作者：陈言必行，版权归原作者所有，如需转载，请联系作者。

原文链接：czhenya.blog.csdn.net/article/details/77870495