Java poi 读取Excel文件，为什么只有三行的数据，却读出3800多行？

Java poi 读取Excel文件，为什么只有三行的数据，却读出3800多行？

参考代码
public void getValueOfFormulaCell() throws IOException
{
FileInputStream xlsfile = new FileInputStream(new File("D:\\Desktop\\Temp\\marks.xls"));
HSSFWorkbook objWorkbook = new HSSFWorkbook(xlsfile);
Sheet sheet = objWorkbook.getSheetAt(0);
FormulaEvaluator evaluator = objWorkbook.getCreationHelper().createFormulaEvaluator();

// suppose your formula is in B4
CellReference cellReference = new CellReference("B4");
Row row = sheet.getRow(cellReference.getRow());
Cell cell = row.getCell(cellReference.getCol());

CellValue cellValue = evaluator.evaluate(cell);

switch (cellValue.getCellType()) {
case Cell.CELL_TYPE_BOOLEAN:
System.out.println(cellValue.getBooleanValue());
break;
case Cell.CELL_TYPE_NUMERIC:
System.out.println(cellValue.getNumberValue());
break;
case Cell.CELL_TYPE_STRING:
System.out.println(cellValue.getStringValue());
break;
case Cell.CELL_TYPE_BLANK:
break;
case Cell.CELL_TYPE_ERROR:
break;

// CELL_TYPE_FORMULA will never happen
case Cell.CELL_TYPE_FORMULA:
break;
}
}