用了享元模式,就有了共享對象實例總數就會大大減少
Program.cs
Program.cs
using System;
using System.Collections.Generic;
using System.Collections;
using System.Text;
namespace 享元模式
{
class Program
{
static void Main(string[] args)
{
WebSiteFactory f = new WebSiteFactory();
WebSite fx = f.GetWebSiteCategory("產品展示");
fx.Use(new User("小菜"));
WebSite fy = f.GetWebSiteCategory("產品展示");
fy.Use(new User("大鳥"));
WebSite fz = f.GetWebSiteCategory("產品展示");
fz.Use(new User("嬌嬌"));
WebSite fl = f.GetWebSiteCategory("博客");
fl.Use(new User("老頑童"));
WebSite fm = f.GetWebSiteCategory("博客");
fm.Use(new User("桃谷六仙"));
WebSite fn = f.GetWebSiteCategory("博客");
fn.Use(new User("南海鱷神"));
Console.WriteLine("得到網站分類總數爲 {0}", f.GetWebSiteCount());
//string titleA = "大話設計模式";
//string titleB = "大話設計模式";
//Console.WriteLine(Object.ReferenceEquals(titleA, titleB));
Console.Read();
}
}
//用戶
public class User
{
private string name;
public User(string name)
{
this.name = name;
}
public string Name
{
get { return name; }
}
}
//網站工廠
class WebSiteFactory
{
private Hashtable flyweights = new Hashtable();
//獲得網站分類
public WebSite GetWebSiteCategory(string key)
{
if (!flyweights.ContainsKey(key))
flyweights.Add(key, new ConcreteWebSite(key));
return ((WebSite)flyweights[key]);
}
//獲得網站分類總數
public int GetWebSiteCount()
{
return flyweights.Count;
}
}
//網站
abstract class WebSite
{
public abstract void Use(User user);
}
//具體的網站
class ConcreteWebSite : WebSite
{
private string name = "";
public ConcreteWebSite(string name)
{
this.name = name;
}
public override void Use(User user)
{
Console.WriteLine("網站分類:" + name + " 用戶:" + user.Name);
}
}
}