excel-获取最后一行导致的bug

static Map<String, String> map = new HashMap<>();

    //第二次开发  找到两张表的差异
    public static void main111(String[] args) throws Exception {
        System.out.println("----start----");
        map.clear();
        File file1 = new File("D:\\何旭光\\0824\\返修总表.xlsx");
        File file2 = new File("D:\\何旭光\\0824\\需要反刷的海外ADU清单.xlsx");

        find(file1, file2);
        find(file2, file1);

        Set set= map.keySet();

        for(Object s:set){


            System.out.println("  没找到： "+s);
        }


        System.out.println("----end----");
    }

    public static void find(File file1, File file2) throws Exception {
        FileInputStream stream1 = new FileInputStream(file1);
        XSSFWorkbook workbook1 = new XSSFWorkbook(stream1);
        FileInputStream stream2 = new FileInputStream(file2);
        XSSFWorkbook workbook2 = new XSSFWorkbook(stream2);


        XSSFSheet sheet2 = workbook2.getSheetAt(0);
        XSSFSheet sheet1 = workbook1.getSheetAt(0);


        int time = 0;
        int count = 0;
        int lastRowNum2 = sheet2.getLastRowNum();
        for (int i = 0; i < lastRowNum2+1; i++) {
            XSSFRow row2 = sheet2.getRow(i);
            if (row2 == null) {
                continue;
            }
            XSSFCell cell = row2.getCell(1);
            if (cell == null) {
                continue;
            }

            String stringCellValue = cell.getStringCellValue();

            int lastRowNum1 = sheet1.getLastRowNum();
            Boolean flag = false;
            if(i==lastRowNum2-1){
                System.out.println(stringCellValue+"最后");
            }


            //第2个表
            for (int j = 0; j < lastRowNum1+1; j++) {
                XSSFRow row1 = sheet1.getRow(j);
                if (row1 == null) {
                    continue;
                }
                XSSFCell cell1 = row1.getCell(1);
                if (cell1 == null) {
                    continue;
                }

                String stringCellValue1 = cell1.getStringCellValue();
                if (stringCellValue1.equals(stringCellValue)) {
                    flag = true;
                    break;
                }

            }
            if (flag) {

            } else {
                map.put(stringCellValue, "");


            }

        }
        workbook2.close();
        stream2.close();
        workbook1.close();
        stream1.close();
        System.out.println("end");
    }