程序设计: 猫大叫一声，所有的老鼠都开始逃跑，主人被惊醒

程序设计: 猫大叫一声，所有的老鼠都开始逃跑，主人被惊醒。(C#语言)
要求： 1.要有联动性，老鼠和主人的行为是被动的。
2.考虑可扩展性，猫的叫声可能引起其他联动效应。

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

 

namespace CatMouse

{

    class Program

    {

        static void Main(string[] args)

        {

            Cat cat = new Cat();

            Mouse mouse1 = new Mouse("mouse1", cat);

            Mouse mouse2 = new Mouse("mouse2", cat);

            Master master = new Master(cat);

            cat.Cry();

            Console.ReadLine();

 

        }

    }

    public delegate void SubEventHandler();

    public abstract class Subject

    {

        public event SubEventHandler SubEvent;

        protected void FireAway()

        {

            if (this.SubEvent != null)

                this.SubEvent();

        }

    }

    public class Cat : Subject

    {

        public void Cry()

        {

            Console.WriteLine("cat cryed.");

            this.FireAway();

        }

    }

    public abstract class Observer

    {

        public Observer(Subject sub)

        {

            sub.SubEvent += new SubEventHandler(Response);

        }

        public abstract void Response();

    }

    public class Mouse : Observer

    {

        private string name;

        public Mouse(string name, Subject sub)

            : base(sub)

        {

            this.name = name;

        }

        public override void Response()

        {

            Console.WriteLine(name + " attempt to escape!");

        }

    }

    public class Master : Observer

    {

        public Master(Subject sub) : base(sub) { }

        public override void Response()

        {

            Console.WriteLine("host waken");

        }

    }

 

}