code: public static final void setFormat(String format, Locale locale)
      {
          threadFormat.set(format);
          threadLocale.set(locale);
      }
docs: Set Format string and locale for calling thread. List items are formatted
  using these. It is good practice to call removeFormat after use.
  @param locale
  @see #removeFormat()
  @see java.lang.String#format(java.util.Locale, java.lang.String, java.lang.Object...)