如何用java定义Excel工作表的动态单元格范围？

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

Workbook workbook = new XSSFWorkbook();

Sheet sheet = workbook.createSheet("Sheet1");

Row row = sheet.createRow(0);

Cell cell = row.createCell(0);
cell.setCellValue("Hello");

CellRangeAddress range = new CellRangeAddress(0, 0, 0, 1);
sheet.addMergedRegion(range);

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class ExcelExample {
    public static void main(String[] args) {
        Workbook workbook = new XSSFWorkbook();
        Sheet sheet = workbook.createSheet("Sheet1");
        Row row = sheet.createRow(0);
        Cell cell = row.createCell(0);
        cell.setCellValue("Hello");

        CellRangeAddress range = new CellRangeAddress(0, 0, 0, 1);
        sheet.addMergedRegion(range);

        try {
            FileOutputStream outputStream = new FileOutputStream("example.xlsx");
            workbook.write(outputStream);
            workbook.close();
            outputStream.close();
            System.out.println("Excel文件已成功创建。");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}