Method parseAmount

base/src/main/java/net/time4j/Duration.java:3879–3893

(
        String period,
        String number,
        int index
    )

    }

    private static long parseAmount(
        String period,
        String number,
        int index
    ) throws ParseException {

        try {
            return Long.parseLong(number);
        } catch (NumberFormatException nfe) {
            ParseException pe = new ParseException(period, index);
            pe.initCause(nfe);
            throw pe;
        }

    }

    /**
     * @serialData  Uses <a href="../../serialized-form.html#net.time4j.SPX">