HSSFSheet sheet = wb.createSheet();
List<HSSFDataValidation> list = sheet.getDataValidations();
assertEquals(0, list.size());
DataValidationHelper dataValidationHelper = sheet.getDataValidationHelper();
DataValidationConstraint constraint = dataValidationHelper.createDateConstraint(OperatorType.EQUAL,
"2014/10/25", null, null);
CellRangeAddressList addressList = new CellRangeAddressList(0, 0, 0, 0);
DataValidation validation = dataValidationHelper.createValidation(constraint, addressList);
sheet.addValidationData(validation);