flyweightfactory.java

23种GOF模式的java代码实现

package org.gof.structure.Flyweight;

import java.util.Hashtable;

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

  public Flyweight getFlyweight(Object key) {

    Flyweight flyweight = (Flyweight) flyweights.get(key);
    //去掉重复的
    if (flyweight == null) {
      //产生新的ConcreteFlyweight
      flyweight = new ConcreteFlyweight();
      flyweights.put(key, flyweight);
    }
    return flyweight;
  }
}