throws an exception if the current token is not a string . otherwise , returns that string and moves to the next token . concode_field_sep StreamTokenizer tok concode_elem_sep Collection<String> keywords concode_field_sep boolean matchDelim concode_elem_sep boolean matchIntConstant concode_elem_sep void eatDelim concode_elem_sep int eatIntConstant concode_elem_sep boolean matchKeyword concode_elem_sep void nextToken concode_elem_sep void initKeywords concode_elem_sep boolean matchStringConstant concode_elem_sep void eatKeyword concode_elem_sep boolean matchId concode_elem_sep String eatId