计算机等考：Java设计模式之Flyweight模式[1]

　　这个工厂方法类非常关键，这里详细解释一下：

　　在1处定义了一个Hashtable用来存储各个对象;在2处选出要实例化的对象，在6处将该对象返回，如果在Hashtable中没有要选择的对象，此时变量flyweight为null，产生一个新的flyweight存储在Hashtable中，并将该对象返回。

　　最后看看Flyweight的调用：

　　package Flyweight;

　　import java.util.Hashtable;

　　public class FlyweightPattern ...{

　　FlyweightFactory factory = new FlyweightFactory();

　　Flyweight fly1;

　　Flyweight fly2;

　　Flyweight fly3;

　　Flyweight fly4;

　　Flyweight fly5;

　　Flyweight fly6;

　　/** *//** Creates a new instance of FlyweightPattern */

　　public FlyweightPattern() ...{

　　fly1 = factory.getFlyWeight("Google");

　　fly2 = factory.getFlyWeight("Qutr");

　　fly3 = factory.getFlyWeight("Google");

　　fly4 = factory.getFlyWeight("Google");

　　fly5 = factory.getFlyWeight("Google");

　　fly6 = factory.getFlyWeight("Google");

　　}//end FlyweightPattern()

　　public void showFlyweight()

　　...

　　{

　　fly1.operation();

　　fly2.operation();

　　fly3.operation();

　　fly4.operation();

　　fly5.operation();

　　fly6.operation();

　　int objSize = factory.getFlyweightSize();

　　System.out.println("objSize = " + objSize);

　　}//end showFlyweight()

　　public static void main(String[] args)

　　...

　　{

　　System.out.println("The FlyWeight Pattern!");

　　FlyweightPattern fp = new FlyweightPattern();

　　fp.showFlyweight();

　　}//end main(...)

　　}//end class FlyweightPattern