设计模式之享元模式

最新推荐文章于 2025-03-03 06:30:00 发布

tiandesheng111

最新推荐文章于 2025-03-03 06:30:00 发布

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本文链接：https://blog.youkuaiyun.com/tiandesheng111/article/details/39777865

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定义：运用共享技术有效地支持大量细粒度的对象。

结构图：

示例代码：

public interface WebSite {

	public void use();
}
public class ConcreteWebSite implements WebSite {

	private String name = "";

	@Override
	public void use() {
		// TODO Auto-generated method stub
		System.out.println("网站分类: " + name);
	}

	public ConcreteWebSite(String name) {
		this.name = name;
	}

}
public class WebSiteFactory {

	private Hashtable flyweights = new Hashtable();
	
	public WebSite GetWebSiteCategory(String key) {
		
		if (!flyweights.contains(key)) {
			flyweights.put(key, new ConcreteWebSite(key));
		}
		return (WebSite)flyweights.get(key);
	}
	
	public int GetWebSiteCount() {
		return flyweights.size();
	}
}

public class Client {

	public static void main(String[] args) {
		
		WebSiteFactory f = new WebSiteFactory();
		WebSite fx = f.GetWebSiteCategory("产品展示");
		fx.use();
		
		WebSite fy = f.GetWebSiteCategory("产品展示");
		fy.use();
		
		WebSite fz =  f.GetWebSiteCategory("产品展示");
		fz.use();
		
		WebSite fm = f.GetWebSiteCategory("博客");
		fm.use();
		
		WebSite fn = f.GetWebSiteCategory("博客");
		fm.use();
		
		System.out.println("网站分类总数为" + f.GetWebSiteCount());
		
	}
	
}

运行结果如下：

网站分类: 产品展示

网站分类: 博客

网站分类总数为2