class EtherNet

{

    public  void Send(string data)

    {

        Console.WriteLine("EtherNet is Sending: {0}",data);

    }

}

class EtherNetAdaptor : Device

{

    public EtherNet net ;

    public EtherNetAdaptor()

    {

        net = new EtherNet();

    }

    public void Transform(string data)

    {

        net.Send(data);

    }

}

class COM : Device

{

    public  void Transform(string data)

    {

        Console.WriteLine("COM is Transforming :{0}", data);

    }

}

class USB : Device

{

    public void Transform(string data)

    {

        Console.WriteLine("USB is Transforming :{0}", data);

    }

}

interface Device

{

    void Transform(string data);

}

class Computer

{

    [STAThread]

    static void Main(string[] args)

    {

        Console.WriteLine(" 请输入设备类型：");

        string deviceType = Console.ReadLine().ToLower();

        Console.WriteLine(" 请输入要发送的数据：");

        string data = Console.ReadLine().ToLower();

        Device device=null;

        switch (deviceType)

        {

            case "net":

                device = new EtherNetAdaptor();

                break;

            case "com":

                device = new COM();

                break;

            case "usb":

                device = new USB();

                break;

            default:

                Console.WriteLine(" 对不起，没有此种设备！！");

                break;

        }

        device.Transform(data);

    }

}