code: public static <V> LongObjectHashMap<V> createPrimitiveLongKeyMap(int initialCapacity, float loadFactor) {
  		return new LongObjectHashMap<V>(initialCapacity, loadFactor);
  	}
docs: 创建移植自Netty的key为long的优化HashMap
  
  @param initialCapacity 默认为8
  @param loadFactor 默认为0.5