code: private String render(boolean compact) {
      StringBuilder buf = new StringBuilder();
      render(buf, LANGUAGE, UNDEF_LANGUAGE, compact);
      render(buf, SCRIPT, UNDEF_SCRIPT, compact);
      render(buf, TERRITORY, UNDEF_TERRITORY, compact);
      render(buf, VARIANT, UNDEF_VARIANT, compact);
      return buf.toString();
    }
docs: Render this locale to a string in compact or expanded form.