程式設計: 貓大叫一聲，所有的老鼠都開始逃跑，主人被驚醒。(C#控制台程式)

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程式設計: 貓大叫一聲，所有的老鼠都開始逃跑，主人被驚醒。(C#語言)

要求：  

1.要有聯動性，老鼠和主人的行為是被動的。

2.考慮可擴充性，貓的叫聲可能引起其他聯動效應。 

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 第一種解決方案用事件來解決：是多級的聯動：即：貓叫-》老鼠跑-》人醒

     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");         }     }     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();         }      } 

 

 第二種解決方案採用觀察者模式：貓叫-》老鼠跑；貓叫-》人醒

 public interface Observer     {         void Response();    //觀察者的響應，如是老鼠見到貓的反映     }     public interface Subject     {         void AimAt(Observer obs);  //針對哪些觀察者，這裡指貓的要撲捉的對象---老鼠     }     public class Mouse : Observer     {public Mouse(Subject subj)         {                        subj.AimAt(this);         }                  public void Response()         {             Console.WriteLine(name + " 老鼠開始逃跑了!");         }     }     public class Master : Observer     {            public Master(Subject subj)         {                        subj.AimAt(this);         }                  public void Response()         {             Console.WriteLine("主人被驚醒!");         }       }       public class Cat : Subject     {         private ArrayList observers;         public Cat()         {                this.observers = new ArrayList();         }         public void AimAt(Observer obs)         {             this.observers.Add(obs);         }         public void Cry()         {             Console.WriteLine("貓叫了!");             foreach (Observer obs in this.observers)             {                 obs.Response();             }         }     }     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();         }     } 

 

程式設計: 貓大叫一聲，所有的老鼠都開始逃跑，主人被驚醒。(C#控制台程式)