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我们继续看享元工厂，如代码清单28-9所示。
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代码清单28-9 享元工厂
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public class FlyweightFactory{
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//定义一个池容器
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private static HashMap＜String,Flyweight＞pool=new HashMap＜String,Flyweight＞（）；
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//享元工厂
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public static Flyweight getFlyweight（String Extrinsic）{
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//需要返回的对象
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Flyweight flyweight=null；
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//在池中没有该对象
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if（pool.containsKey（Extrinsic））{
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flyweight=pool.get（Extrinsic）；
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}else{
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//根据外部状态创建享元对象
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flyweight=new ConcreteFlyweight1（Extrinsic）；
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//放置到池中
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pool.put（Extrinsic,flyweight）；
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}
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return flyweight；
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}
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}
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设计模式之禅 28.3 享元模式的应用
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28.3.1 享元模式的优点和缺点
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