インタフェース向けのプログラミングの良い例

プログラム設計:猫が大声で叫ぶと、すべてのネズミが逃げ始め、主人が目を覚まされた.(C#言語)要求:1.連動性を持つには、ネズミと主人の行為は受動的だ.          2.拡張性を考慮すると、猫の鳴き声は他の連動効果を引き起こす可能性がある.ポイント:1.連動効果、実行コードはCat.Cryed()メソッド.
         2. ネズミと飼い主に対して抽象的な採点基準を行う.
<1>.Cat,Mouse,Masterの3つのクラスを構築し,プログラムを実行させる(2点)<2>MouseとMasterから抽象(5点)<3>連動効果を抽出し,Cat.Cryed()を実行すればネズミを逃がし,飼い主を目覚めさせることができる.(3点)
 
 

 public interface Observer
    {
        void Response();    //      ，          
    }
    public interface Subject
    {
        void AimAt(Observer obs);  //       ，           ---  
    }
    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();
        }
    } 

 

 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();
        }
    }