using System; using System.Collections.Generic; using System.Text; namespace 抽象方法练习 { class Program { static void Main(string[] args) { Computer dev = new Computer(); MP3 mp3 = new MP3(); YDDisk yd = new YDDisk(); dev.dev = yd; dev.dev.Read();//输入是移动硬盘在读数据。。。。。 dev.dev.Write(); Console.ReadKey(); } } abstract class Disk { public abstract void Read(); public abstract void Write(); } class YDDisk : Disk { public override void Read() { Console.WriteLine("移动硬盘在读数据。。。。。"); } public override void Write() { Console.WriteLine("移动硬盘在写数据。。。。。"); } } class MP3 : Disk { public override void Read() { Console.WriteLine("MP3在读数据。。。。。"); } public override void Write() { Console.WriteLine("MP3在写数据。。。。。"); } public void PlayMusic() { Console.WriteLine("MP3在放音乐。。。。。"); } } class Computer { public Disk dev { get; set; } void Read() { dev.Read(); } void Write() { dev.Write(); } } }