POI獲取excel中函數計算所得的值

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellValue;
import org.apache.poi.ss.usermodel.FormulaEvaluator;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

Workbook wb=new XSSFWorkbook();
  Sheet sheet = wb.createSheet();
  Row row = sheet.createRow(0);
  Cell cell0 = row.createCell(0);
  Cell cell1 = row.createCell(1);
  Cell cell2 = row.createCell(2);
  cell0.setCellValue(2);
  cell1.setCellValue(2);
  cell2.setCellType(Cell.CELL_TYPE_FORMULA);
  cell2.setCellFormula("SUM(A1+B1)");
  FormulaEvaluator evaluator = wb.getCreationHelper().createFormulaEvaluator();
  evaluator.evaluateFormulaCell(cell2);
  CellValue cellValue = evaluator.evaluate(cell2);
  
  System.out.println(cellValue.getNumberValue());