code: @Override
    public void clear()
    {
      if (_size > 0) {
        final K []keys = _keys;
        final V []values = _values;
        final int length = values.length;
  
        for (int i = length - 1; i >= 0; i--) {
          keys[i] = null;
          values[i] = null;
        }
  
        _size = 0;
      }
  
      _nullValue = null;
    }
docs: Clears the cache