examples/src/main/java/org/apache/poi/examples/xssf/usermodel/CellComments.java

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   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
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package org.apache.poi.examples.xssf.usermodel;

import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.ClientAnchor;
import org.apache.poi.ss.usermodel.Comment;
import org.apache.poi.ss.usermodel.CreationHelper;
import org.apache.poi.ss.usermodel.Drawing;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.RichTextString;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.CellAddress;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

/**
 * Demonstrates how to work with excel cell comments.
 *
 * <p>
 * Excel comment is a kind of a text shape,
 * so inserting a comment is very similar to placing a text box in a worksheet
 * </p>
 *
 * @author Yegor Kozlov
 */
public class CellComments {
    public static void main(String[] args) throws IOException {
        try (Workbook wb = new XSSFWorkbook()) {

            CreationHelper factory = wb.getCreationHelper();

            Sheet sheet = wb.createSheet();

            Cell cell1 = sheet.createRow(3).createCell(5);
            cell1.setCellValue("F4");

            Drawing<?> drawing = sheet.createDrawingPatriarch();

            ClientAnchor anchor = factory.createClientAnchor();

            Comment comment1 = drawing.createCellComment(anchor);
            RichTextString str1 = factory.createRichTextString("Hello, World!");
            comment1.setString(str1);
            comment1.setAuthor("Apache POI");
            cell1.setCellComment(comment1);

            Cell cell2 = sheet.createRow(2).createCell(2);
            cell2.setCellValue("C3");

            Comment comment2 = drawing.createCellComment(anchor);
            RichTextString str2 = factory.createRichTextString("XSSF can set cell comments");
            //apply custom font to the text in the comment
            Font font = wb.createFont();
            font.setFontName("Arial");
            font.setFontHeightInPoints((short) 14);
            font.setBold(true);
            font.setColor(IndexedColors.RED.getIndex());
            str2.applyFont(font);

            comment2.setString(str2);
            comment2.setAuthor("Apache POI");
            comment2.setAddress(new CellAddress("C3"));

            try (FileOutputStream out = new FileOutputStream("comments.xlsx")) {
                wb.write(out);
            }
        }
    }
}