code: public static String asCommaSeparatedValues(String... args) {
          List<String> newList = new ArrayList<String>();
          Collections.addAll(newList, args);
          return Strings.asTokenSeparatedValues(",", newList);
      }
docs: This method converts a collection of strings to a comma separated list of strings
  @param args list of string arguments
  @return {@code String} new comma separated string