private Format getDefaultFormat(double cellValue) {
        localeChangedObservable.checkForLocaleChange();

        // for numeric cells try user supplied default
        if (defaultNumFormat != null) {
            return defaultNumFormat;

            // otherwise use general format
        }
        return generalNumberFormat;
    }
Returns a default format for a cell.

@param cell The cell
@return a default format
fastexcel-test/src/test/java/cn/idev/excel/test/temp/dataformat/DataFormatter1.java