猫叫问题一

猫大叫一声，所有的老鼠都开始逃跑，主人被惊醒。(C#语言)

1.要有联动性，老鼠和主人的行为是被动的。

分析：老鼠与主人都是观察者，都对猫的动作进行响应，他们与猫对象有关联响应。老鼠与主人的对象都被猫联动。

代码如下：

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(); Console.ReadLine(); } }