Apache poi java中公式求值时如何将空白单元格设置为0

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

public class FormulaEvaluationExample {
    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(10); // 设置单元格的值为10

        // 创建一个空白单元格
        Cell blankCell = row.createCell(1, CellType.BLANK);

        // 创建一个公式单元格，求和前两个单元格的值
        Cell formulaCell = row.createCell(2, CellType.FORMULA);
        formulaCell.setCellFormula("A1+B1");

        // 设置空白单元格为0
        if (blankCell.getCellType() == CellType.BLANK) {
            blankCell.setCellType(CellType.NUMERIC);
            blankCell.setCellValue(0);
        }

        // 求值公式
        FormulaEvaluator evaluator = workbook.getCreationHelper().createFormulaEvaluator();
        evaluator.evaluateFormulaCell(formulaCell);

        // 获取求值后的结果
        double result = formulaCell.getNumericCellValue();
        System.out.println("求和结果：" + result);

        workbook.close();
    }
}