Structural -- Flyweight

--- Flyweight.java ---

package structural.flyweight;

public interface Flyweight {

void sampleOperation(Context context);

}

--- ConcreteFlyweight.java ---

package structural.flyweight;

public class ConcreteFlyweight implements Flyweight {

public ConcreteFlyweight(Object key) {

}

public void sampleOperation(Context context) {

}

}

--- FlyweightFactory.java ---

package structural.flyweight;

import java.util.HashMap;

public class FlyweightFactory {

private HashMap theFlyweights;

public FlyweightFactory() {
theFlyweights = new HashMap();
}

public Flyweight getConcreteFlyweight(Object key) {
if (theFlyweights.containsKey(key)) {
return (Flyweight) theFlyweights.get(key);
} else {
Flyweight newFlyweight = new ConcreteFlyweight(key);
theFlyweights.put(key, newFlyweight);
return newFlyweight;
}
}

}

--- Context.java ---

package structural.flyweight;

public class Context {

}