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设计模式——享元模式
Flyweight 直译为蝇量。就其表示的模式来说，翻译成享元，确实是不错的
package designpattern.structure.flyweight;public interface Flyweight { void action(int arg);}package designpattern.structure.flyweight;public class FlyweightImpl implements Flyweight { public void action(int arg) { // TODO Auto-generated method stub System.out.println("FlyweightImpl.action()"); }}package designpattern.structure.flyweight;import java.util.HashMap;import java.util.Map;public class FlyweightFactory { private static Map<String,Flyweight> flyweights = new HashMap<String,Flyweight>(); public FlyweightFactory(String arg) { flyweights.put(arg, new FlyweightImpl()); } public static Flyweight getFlyweight(String key) { if (flyweights.get(key) == null) { flyweights.put(key, new FlyweightImpl()); } return flyweights.get(key); } public static int getSize() { return flyweights.size(); }}package designpattern.structure.flyweight;public class Client { /** * * Fly微Weight量模式 —— 将小对象缓存起来的艺术。、、 * */ public static void main(String[] args) { Flyweight fly1 = FlyweightFactory.getFlyweight("a"); fly1.action(1); Flyweight fly2 = FlyweightFactory.getFlyweight("a"); System.out.println(fly1 == fly2); Flyweight fly3 =FlyweightFactory.getFlyweight("b"); fly3.action(2); Flyweight fly4 = FlyweightFactory.getFlyweight("c"); fly4.action(3); Flyweight fly5 =FlyweightFactory.getFlyweight("d"); fly4.action(4); System.out.println(FlyweightFactory.getSize()); }}
总结：
1 主要就是两个角色： 元或者说pojo角色—— 主要属性是其内部状态； 工厂角色，用来获取‘元’
2 ‘享’ 的具体实现是—— 工厂获取‘元’的时候，如果已经已经创建过，则直接取出返回；如果没，则创建并加入缓存，再返回
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