public static RelativeDateTimeFormatter getInstance(ULocale locale, NumberFormat nf) {
        return getInstance(locale, nf, Style.LONG, DisplayContext.CAPITALIZATION_NONE);
    }
public static RelativeDateTimeFormatter getInstance ( ULocale locale , NumberFormat nf ) { return getInstance ( locale , nf , Style . LONG , DisplayContext . CAPITALIZATION_NONE ) ; }
Returns a RelativeDateTimeFormatter for a particular locale that uses a particular
NumberFormat object.

@param locale the locale
@param nf the number format object. It is defensively copied to ensure thread-safety
and immutability of this class.
@return An instance of RelativeDateTimeFormatter.