Java apache poi indexoutofbound异常

Excel文件（test1.xlsx）
NameGenderageSign日期
AliM20
AbuM25
SitiF30

代码

public class ReadExcel {

public static ArrayList<String> record;

public static void main(String[] args) throws FileNotFoundException, IOException {

 //---Read file---
FileInputStream in = new FileInputStream("test1.xlsx");
XSSFWorkbook workbook = new XSSFWorkbook(in);
XSSFSheet spreadsheet = workbook.getSheetAt(0);
XSSFRow row;
Cell cell;

Iterator<Row> rowIterator = spreadsheet.iterator();

while(rowIterator.hasNext()){
    record = new ArrayList<String>();
    row = (XSSFRow)rowIterator.next();

    if(row.getRowNum()==0) {
        continue;
    }

     for(int k = 0; k < row.getLastCellNum();k++){
        cell = row.getCell(k, Row.CREATE_NULL_AS_BLANK);
    }

    Iterator<Cell> cellIterator = row.cellIterator();

    while(cellIterator.hasNext()){
            cell = cellIterator.next();
            cell.setCellType(Cell.CELL_TYPE_STRING); 

            switch(cell.getCellType()){
                case Cell.CELL_TYPE_STRING:
                    record.add(cell.getStringCellValue());
                    System.out.print(cell.getStringCellValue());
                    break;
                case Cell.CELL_TYPE_NUMERIC:
                    Double value = cell.getNumericCellValue();
                    Long longValue = value.longValue();

                    record.add(Double.toString(cell.getNumericCellValue()));
                    System.out.print(cell.getNumericCellValue());
                    break;
            }
        }   
        System.out.println();

        String name = record.get(0);
        String gender = record.get(1);
        String age = record.get(2);
        String dateLeave = record.get(3);  //[ERROR]

        System.out.println(name + gender + age + dateLeave);
        }
    }
}

---

我犯了什么错误？

您的代码试图引用集合中只有三个元素的第四个元素：

record.get(3)

for(int k = 0; k < 4; k++){
    cell = row.getCell(k, Row.CREATE_NULL_AS_BLANK);
}

因为只有三个元素，所以尝试引用第四个元素会产生错误

为什么只有三个元素？

好吧，看看数据：

Ali     M     20
Abu     M     25
Siti    F     30

每行三个元素

看起来代码正在动态检查最后一个“元素”：

---

你调试过这个吗？

for(int k = 0; k < row.getLastCellNum(); k++){
    cell = row.getCell(k, Row.CREATE_NULL_AS_BLANK);
}

for(int k = 0; k < 4; k++){
    cell = row.getCell(k, Row.CREATE_NULL_AS_BLANK);
}