如果用户不使用Java输入任何值，如何将默认值添加到Excel单元格？

Question

我正在创建一个Excel工作表并将数据写入其中。我将在另一个程序中阅读excel表。

现在，用户可以更新excel表中的数据。但是，如果用户删除当前数据并且不在该单元格中添加任何值，则excel应自动添加默认值。我怎么能在java中做到这一点？

我发布了一个在单元格中写入一些值的函数：

....
public static final void addVerificationTagData(Document d){
    String data[] = {"Y","Y","N","N","Y","Y","Y","Y","Y","Y","N","N","Y","Y","N","N","Y","Y","N","N","N","N"};
    //HSSFSheet sheet = workbook.getSheet("EDR Raw Data");
    int personLen = d.getElementsByTagName("ecs:Person").getLength();
    for(int i = 1;i <= personLen;i++){
        int count = 0;
        for(int rn = 6;rn <= 27;rn++){
            Row r = sheet.getRow(rn);
            r.createCell(i).setCellValue(data[count]);
            //r.setRowStyle(cellStyle1);
            count++;
        }
        //sheet.autoSizeColumn(i);
    }
}
....

如果用户从单元格中删除了该值并且没有添加任何内容，是否有任何方法可以将添加的值设置为默认值？