Review

class BigFractionFormat {
    /**
     * Formats a {@link BigFraction} object to produce a string.  The BigFraction is
     * output in improper format.
     *
     * @param BigFraction the object to format.
     * @param toAppendTo where the text is to be appended
     * @param pos On input: an alignment field, if desired. On output: the
     *            offsets of the alignment field
     * @return the value passed in as toAppendTo.
     */
    public StringBuffer format(final BigFraction BigFraction,
                               final StringBuffer toAppendTo, final FieldPosition pos) {

        pos.setBeginIndex(0);
        pos.setEndIndex(0);

        getNumeratorFormat().format(BigFraction.getNumerator(), toAppendTo, pos);
        toAppendTo.append(" / ");
        getDenominatorFormat().format(BigFraction.getDenominator(), toAppendTo, pos);

        return toAppendTo;
    }

}