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运行服务器时出现此错误,如何解决此问题？

我想使用没有标题标题的 poi 读取 excel 文件，我的预期结果是

这是我的代码

public String processExcel(Model model, @RequestParam(value = "excelfile", required = false) MultipartFile excelfile, HttpSession session) {        

        try {
            List<UserRegistrationDetail> lstUser = new ArrayList<>();

            Workbook workbook = null;

            if (excelfile.getOriginalFilename().endsWith("xlsx")) {
                workbook = new XSSFWorkbook(excelfile.getInputStream());
            } else if (excelfile.getOriginalFilename().endsWith("xls")) {
                workbook = new HSSFWorkbook(excelfile.getInputStream());
            } else {
                model.addAttribute("msg", new IllegalArgumentException("The specified file is not Excel file"));
            }

            Sheet worksheet = workbook.getSheetAt(0);


        Iterator<Row> iterator = worksheet.iterator();
        while (iterator.hasNext()) {
            Row nextRow = iterator.next();
            Iterator<Cell> cellIterator = nextRow.cellIterator(); …

我有像这样的变量int数组

int[] sample = new int[];
sample[0] = 1;
sample[1] = 2;

String two = sample[1].toString(); <==== i have problem with this

System.out.println(two);

如何解决它们？我不能将int [1]的值显示为字符串..