private static boolean isUnreservedCharacter(char p_char){
  return (isAlphanum(p_char) || MARK_CHARACTERS.indexOf(p_char) != -1);
}

private static boolean isUnreservedCharacter ( char p_char ) { return ( isAlphanum ( p_char ) || MARK_CHARACTERS . indexOf ( p_char ) != - 1 ) ; }
determine whether a char is an unreserved character .
