class Duration implements Cloneable, Serializable, Comparable<Duration>, JAXBable<JAXBDuration> {

    public static Duration create(ChronoUnit unit, BigDecimal magnitude)
    {
        Class<? extends Duration> type = fromChronoUnit(unit);
        return type == null ? null : create(type, magnitude);
    }

    public  Duration(BigDecimal magnitude);
    protected  Duration(long unscaledMagnitude, int scale);

}