private boolean isWhitespace(int position){
  if (_len >= 0 && position >= _len) {
    return false;
  }
  return Character.isWhitespace(_working[position]);
}

private boolean isWhitespace ( int position ) { if ( _len >= 0 && position >= _len ) { return false ; } return Character . isWhitespace ( _working [ position ] ) ; }
checks if character at specified position is whitespace .
