第三个案例（移动设备）

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编写ModelDisk父类

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace Mobile{    public abstract class ModelDisk    {        public abstract void Read();        public abstract void Write();    }}

编写UDisk类继承父类

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace Mobile{    public class UDisk : ModelDisk    {        public override void Read()        {            Console.WriteLine("Read UDISK");        }        public override void Write()        {            Console.WriteLine("Write UDISK");        }    }}

主函数的编写

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace Mobile{    class Program    {        static void Main(string[] args)        {            Computer c = new Computer();            //子类新建一个对象传值给父类对象            c.MDK = new UDisk();            c.Read();            c.Write();            Console.ReadKey();        }    }}

Computer类的实现

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace Mobile{    public class Computer    {        public ModelDisk MDK { get; set; }        public void Read()        {            MDK.Read();        }        public void Write()        {            MDK.Write();        }    }}

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