大话设计模式 享元模式

package org.ustc.flyweight;public class User {private String name;public String getName() {return name;}public void setName(String name) {this.name = name;}public User(String name) {this.name = name;}}

package org.ustc.flyweight;public interface Website {void Use(User user);}

package org.ustc.flyweight;import java.util.HashMap;import java.util.Map;public class WebsiteFactory {private Map<String,Website> websites;public WebsiteFactory() {// TODO Auto-generated constructor stubwebsites = new HashMap<String, Website>();}public Website getWebsite(String type){if(!websites.containsKey(type))websites.put(type, new ConcreteWebsite(type));return websites.get(type);}}

package org.ustc.flyweight;public class ConcreteWebsite implements Website{private String type;public ConcreteWebsite(String type) {super();this.type = type;}public String getType() {return type;}public void setType(String type) {this.type = type;}@Overridepublic void Use(User user) {// TODO Auto-generated method stubSystem.out.println("Type:"+type+"User:"+user.getName());}}

package org.ustc.flyweight;public class Main {/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubWebsiteFactory fact = new WebsiteFactory();User user1 = new User("令狐冲");Website website1 = fact.getWebsite("产品展示");website1.Use(user1);User user2 = new User("岳不群");Website website2 = fact.getWebsite("产品展示");website2.Use(user2);User user3 = new User("任我行");Website website3 = fact.getWebsite("博客");website3.Use(user3);}}