抽象类课堂练习题
抽象类课堂练习题<div id="cnblogs_post_body">练习题题目：要实现U盘、MP3播放器、移动硬盘三种移动存储设备，要求计算机能通这三种设备进行数据交换，并且以后可能会有新的第三方的移动存储设备，所以计算机必须有扩展性，能与目前为止而以后可能会出现的存储设备进行数据交换。各个存储设备间读、写得实现方法不同，U盘和移动硬盘只有这两个方法，MP3Player还有一个playMusic方法;
<div class="cnblogs_code">using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace Practices03{ class Program { static void Main(string[] args) { Computer myComputer = new Computer(); RSD myRSD = new USB(); myRSD.ReadDate(); myRSD.WriteDate(); Console.ReadKey(); } } /// <summary> /// RSD：移动存储设备 /// </summary> abstract class RSD { public abstract void ReadDate(); public abstract void WriteDate(); } class USB:RSD { public override void ReadDate() { Console.WriteLine("ReadDate method for USB!"); } public override void WriteDate() { Console.WriteLine("WtiteDate method for USB!"); } } class MP3Player:RSD { public override void ReadDate() { Console.WriteLine("ReadDate method for MP3Player!"); } public override void WriteDate() { Console.WriteLine("WtiteDate method for MP3Player!"); } public virtual void PlayMusic() { Console.WriteLine("PlayMusic method for MP3Player!"); } } class MobileHDD:RSD { public override void ReadDate() { Console.WriteLine("ReadDate method for MobileHDD!"); } public override void WriteDate() { Console.WriteLine("WtiteDate method for MobileHDD!"); } } class Computer { public RSD RSD { get; set; } public void ReadDate() { RSD.ReadDate(); } public void WriteDate() { RSD.WriteDate(); } }}
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