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题目：猫叫，老鼠逃跑，主人惊醒。(10分) 要点：1. 联动效果，运行代码只要执行Cat.Cryed()方法。2. 对老鼠和主人进行抽象 using System;
using System.Collections;
namespace ConsoleApplication1
{
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
{
/**//// <summary> /// 应用程序的主入口点。
/// </summary>
[STAThread] 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.. 程序代码 using System;
using System.Collections;
namespace ConsoleApplication1
{
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 MainClass
{
/**//// <summary> /// 应用程序的主入口点。
/// </summary>
[STAThread] 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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