code: public V get(Object key) {
      EntryImpl<K, V> entry = _entries[keyHash(key) & _mask];
      while (entry != null) {
        if (key == entry._key || key.equals(entry._key)) return entry._value;
        entry = entry._next;
      }
      return null;
    }
docs: Returns the value to which this {@link FastMap} maps the specified key.
  
  @param key the key whose associated value is to be returned.
  @return the value to which this map maps the specified key,
  or <code>null</code> if there is no mapping for the key.
  @throws NullPointerException if key is <code>null</code>.