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ÔÚFlyweightģʽÖУ¬ÓÉÓÚÒª²úÉú¸÷ÖÖ¸÷ÑùµÄ¶ÔÏó£¬ËùÒÔÔÚ
Flyweight(ÏíÔª)ģʽÖг£³öÏÖFactory ģʽ¡£FlyweightµÄÄÚ²¿×´Ì¬ÊÇÓÃÀ´¹²ÏíµÄ,Flyweight
factory¸ºÔðά»¤Ò»¸ö¶ÔÏó´æ´¢³Ø£¨Flyweight
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Ïȶ¨ÒåÒ»¸ö³éÏóµÄFlyweightÀࣺ
 
package Flyweight;
 
public abstract class Flyweight
...
{
¡¡public abstract void operation();
}//end abstract class Flyweight
 
ÔÚʵÏÖÒ»¸ö¾ßÌåÀࣺ
 
package Flyweight;
 
public class ConcreteFlyweight extends Flyweight
...
{
¡¡private String string;
¡¡public ConcreteFlyweight(String str)
¡¡...
¡¡{
string = str;
¡¡}//end ConcreteFlyweight(...)
 
¡¡public void operation()
¡¡...
¡¡{
System.out.println("Concrete---Flyweight : " + string);
¡¡}//end operation()
 
}//end class ConcreteFlyweight
 
ʵÏÖÒ»¸ö¹¤³§·½·¨Àࣺ
 
package Flyweight;
import java.util.Hashtable;
 
public class FlyweightFactory
...
{
¡¡private Hashtable flyweights = new Hashtable();//----------------------------1
¡¡public FlyweightFactory() ...{}
 
¡¡public Flyweight getFlyWeight(Object obj)
¡¡...
¡¡{
Flyweight flyweight = (Flyweight) flyweights.get(obj);//----------------2
 
if(flyweight == null) ...{//---------------------------------------------------3
¡¡//²úÉúеÄConcreteFlyweight
¡¡flyweight = new ConcreteFlyweight((String)obj);
¡¡flyweights.put(obj, flyweight);//--------------------------------------5
}
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* @(#)ReverseString.java
*
* ReverseString application
*
* @author
* @version 1.00 2010/4/20
*/
import java.util.*;
import java.io.*;

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