POIでExcelデータ取得について

public class Sample {

    public static void main(String[] args) {
        try {
            HSSFWorkbook book = new HSSFWorkbook(new FileInputStream("Sample.xls"));
            HSSFDataFormat fmt = getDataFormat(book);
            HSSFRow row = book.getSheetAt(0).getRow(0);
            for (short i = 0; i < row.getLastCellNum(); i++) {
                HSSFCell cell = row.getCell(i);
                if (cell.getCellType() == HSSFCell.CELL_TYPE_NUMERIC) {
                    System.out.println(getNumericCellValue(cell, fmt));
                }
            }
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static HSSFDataFormat getDataFormat(HSSFWorkbook book) throws Exception {
        Class cls = HSSFWorkbook.class;
        Method mtd = cls.getDeclaredMethod("getWorkbook", null);
        mtd.setAccessible(true);
        Workbook work = (Workbook) mtd.invoke(book, null);
        return new HSSFDataFormat(work);
    }

    private static String getNumericCellValue(HSSFCell cell, HSSFDataFormat fmt) throws Exception {
        double value = cell.getNumericCellValue();
        short fmtNum = cell.getCellStyle().getDataFormat();
        if (fmtNum != 0) {
            DecimalFormat dfmt = new DecimalFormat(fmt.getFormat(fmtNum));
            return dfmt.format(value);
        }
        return String.valueOf(value);
    }
}