感謝回答，不過這篇看起來也只有提到備註，沒有註解功能

那就試試jexcelapi

import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;
import jxl.write.*;
import jxl.write.biff.RowsExceededException;

// Load the Excel file
Workbook workbook = Workbook.getWorkbook(new File("path/to/your/file.xls"));

// Get the desired sheet
Sheet sheet = workbook.getSheet(0);

// Get the cell and its note
Cell cell = sheet.getCell(colNum, rowNum);
String note = cell.getNote();

if (note != null) {
    System.out.println("Cell note: " + note);
}

// Close the workbook
workbook.close();

// Load the Excel file
Workbook workbook = Workbook.getWorkbook(new File("path/to/your/file.xls"));
WritableWorkbook writableWorkbook = Workbook.createWorkbook(new File("path/to/your/updated/file.xls"), workbook);

// Get the desired sheet
WritableSheet sheet = writableWorkbook.getSheet(0);

// Get the cell and create a new note
WritableCell cell = sheet.getWritableCell(colNum, rowNum);
WritableCellFeatures cellFeatures = new WritableCellFeatures();
cellFeatures.setComment("This is a note.");
cell.setCellFeatures(cellFeatures);

// Save the changes to the Excel file
writableWorkbook.write();
writableWorkbook.close();

// Close the workbook
workbook.close();

這程式一看就知道不是我寫的
是問ChatGPT寫的

好的，我試試
ChatGPT真是萬能XD