public interface Flyweight 
{
　　public void operation( ExtrinsicState state );
}

//用於本模式的抽象資料型別(自行設計)
public interface ExtrinsicState { }

}

public class UnsharedConcreteFlyweight implements Flyweight {

　　public void operation( ExtrinsicState state ) { }

}

public class FlyweightFactory { 
　　//Flyweight pool
　　private Hashtable flyweights = new Hashtable(); 

　　public Flyweight getFlyweight( Object key ) { 

　　　　Flyweight flyweight = (Flyweight) flyweights.get(key); 

　　　　if( flyweight == null ) {
　　　　　　//產生新的ConcreteFlyweight
　　　　　　flyweight = new ConcreteFlyweight(); 
　　　　　　flyweights.put( key, flyweight ); 
　　　　} 

　　　　return flyweight; 
　　} 
}

<?xml version="1.0"?>
<collection>

<cd>
<title>Another Green World</title>
<year>1978</year>
<artist>Eno, Brian</artist>
</cd>

<cd>
<title>Greatest Hits</title>
<year>1950</year>
<artist>Holiday, Billie</artist>
</cd>

<cd>
<title>Taking Tiger Mountain (by strategy)</title>
<year>1977</year>
<artist>Eno, Brian</artist>
</cd>

.......

</collection>

public class CD {

　　private String title;
　　private int year;
　　private Artist artist;

　　public String getTitle() {　　return title;　}
　　public int getYear() {　　　　return year;　　}
　　public Artist getArtist() {　　　　return artist;　　}

　　public void setTitle(String t){　　　　title = t;}
　　public void setYear(int y){year = y;}
　　public void setArtist(Artist a){artist = a;}

}

public class Artist {

　　//內部狀態
　　private String name;

　　// note that Artist is immutable.
　　String getName(){return name;}

　　Artist(String n){
　　　　name = n;
　　} 

}

public class ArtistFactory {

　　Hashtable pool = new Hashtable();

　　Artist getArtist(String key){

　　　　Artist result;
　　　　result = (Artist)pool.get(key);
　　　　////產生新的Artist
　　　　if(result == null) {
　　　　　　result = new Artist(key);
　　　　　　pool.put(key,result);
　　　　　　
　　　　}
　　　 return result;
　 }

}