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  • 观察者猫叫案例

    观察者模式:猫叫了-->老鼠跑了,人醒了

     (2010-09-23 17:52:57)
    标签: 

    it

    分类: c#

    猫叫了-->老鼠跑了,人醒了
    public interface Observer
      {
        void Response();  //观察者的响应,如是老鼠见到猫的反映
      }
      public interface Subject
      {
        void AimAt(Observer obs); //针对哪些观察者,这里指猫的要扑捉的对象---老鼠
      }
      public class Mouse : Observer
      {
        private string name;
        public Mouse(string name, Subject subj)
        {    
          this.name = name;
          subj.AimAt(this);
        }
       
        public void Response()
        {
          Console.WriteLine(name + " attempt to escape!");
        }
      }
      public class Master : Observer
      {
        public Master(Subject subj)
        {    
          subj.AimAt(this);
        }
       
        public void Response()
        {
          Console.WriteLine("Host waken!");
        }
      }
     
      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("Cat cryed!");
          foreach (Observer obs in this.observers)
          {
            obs.Response();
          }
        }
      }
      class MainClass
      {  
        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();
        }
      }


    //---------------------------------------------------------------------------------------------

    设计方法二: 使用event -- delegate设计..
      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 Class1
      {
        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();
        }

      }

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  • 原文地址:https://www.cnblogs.com/hpu001/p/10116493.html
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