一个网上流传的猫叫导致的联动的例题的解决方案

在网上看到这样一道题目，也有很多人已经给出答案了，整理下，感觉还挺有意思的。

 

题目：

程序设计: 猫大叫一声，所有的老鼠都开始逃跑，主人被惊醒

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。 

 

方法一：使用C#的委托与事件实现

using System; using System.Collections.Generic; using System.Text; namespace TestApplication.CatMouse { public delegate void TestEventHandler(); public abstract class Subject { public event TestEventHandler TestEvent; public void Activation() { if (TestEvent != null) { this.TestEvent(); } } } public class Cat : Subject { private string name; public Cat(string name) { this.name = name; } public void Shouted() { Console.WriteLine(name + " Cat shouted!"); Console.WriteLine("=============下面是联动效应==============="); this.Activation(); } } public abstract class Observer { public Observer(Subject sub) { sub.TestEvent += new TestEventHandler(Response); } public virtual 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 + " tried to escape "); } } public class Master : Observer { private string name; public Master(string name,Subject sub) : base(sub) { this.name = name; } public override void Response() { Console.WriteLine(name +" waken up!"); } } public class Test { public static void Main(string[] args) { Cat cat = new Cat("ABC"); Mouse m1 = new Mouse("Mouse1", cat); Mouse m2 = new Mouse("Mouse2", cat); Master host = new Master("Mr.Li",cat); cat.Shouted(); Console.ReadLine(); } } }

方法二：采用传统的加入事件的方法

待续。。。