代理模式

最新推荐文章于 2024-09-05 23:35:50 发布

suwanjun881011

最新推荐文章于 2024-09-05 23:35:50 发布

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分类专栏： javabase 文章标签： class interface random string

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public class Client { /** * @param args */ public static void main(String[] args) { Person p = new Person(); PersonTimeProxy ptp = new PersonTimeProxy(p); PersonLogProxy plp = new PersonLogProxy(ptp); plp.buy(); } } ---------------------------------------------------------- public interface ProxyInter { public void buy(); } ---------------------------------------------------------- import java.util.Random; public class Person implements ProxyInter{ public void buy() { System.out.println("person buy something………"); try { Thread.sleep(new Random().nextInt(10000)); } catch (InterruptedException e) { e.printStackTrace(); } } } ------------------------------------------------------ public class PersonLogProxy implements ProxyInter { private ProxyInter pi; public PersonLogProxy(ProxyInter pi) { super(); this.pi = pi; } public void buy() { System.out.println("log write"); pi.buy(); System.out.println("log over"); } } -------------------------------------------------------- public class PersonTimeProxy implements ProxyInter { private ProxyInter pi; public PersonTimeProxy(ProxyInter pi) { super(); this.pi = pi; } public void buy() { long start = System.currentTimeMillis(); System.out.println("starttime:"+start); pi.buy(); long end = System.currentTimeMillis(); System.out.println("alltime:"+(end - start)); }

这里的重点是都实现ProxyInter接口。在每个代理类中都有一个ProxyInter的引用。即为：聚合。（推荐使用）

代理还有一种就是：继承。（一般不用）