How to group rows or columns in Java

EasyXLS Excel library can be used to export Excel files in Java. The library works with any Java SE application and without MS Excel installed.

Step 1: Download EasyXLS Excel Library for Java

To download the trial version of EasyXLS Excel Library, press the below button:

Download EasyXLS™ Excel Library for Java

If you already own a license key, you may login and download EasyXLS from your account.

Install the downloaded EasyXLS installer for v8.6 or earlier.

Step 2: License file setup

Step required for EasyXLS v9.0 or later.

If you are using a trial, generate a trial license file from EasyXLS trials page. The trial license is valid for 30-days.

If you own a license key, you may login to the account that purchased the license and generate the license file from:

Setup the license file into your project using these guidelines.

Step 3: Create a Java project

If don't have a project already, create a new Java project.

Step 4: Include EasyXLS library into project

EasyXLS.jar must be added to external libraries into your project for Eclipse or to your application CLASSPATH.

EasyXLS.jar can be found:
- Inside the downloaded archive at Step 1 for EasyXLS v9.0 or later
- Under installation path for EasyXLS v8.6 or earlier, in "Lib" folder.

Add EasyXLS library to CLASSPATH

Step 5: Run Java code that groups data in Excel sheet

Execute the following Java code that groups data on the first sheet of an Excel file on two outline levels.

package testexceljava;

import EasyXLS.*;
import EasyXLS.Constants.*;

/* -------------------------------------------------------------------------------
 | Tutorial 17
 | This tutorial shows how to create an Excel file with groups on rows in Java.
 | The Excel file has two worksheets. The first one is full with data and contains
 | the data groups.
 * ------------------------------------------------------------------------------- */

public class Tutorial17 {

    public static void main(String[] args) {
        try {
            System.out.println("Tutorial 17");

            // Create an instance of the class that exports Excel files having two sheets
            ExcelDocument workbook = new ExcelDocument(2);

            // Set the sheet names
            workbook.easy_getSheetAt(0).setSheetName("First tab");
            workbook.easy_getSheetAt(1).setSheetName("Second tab");

            // Get the table of data for the first worksheet
            ExcelTable xlsFirstTable = ((ExcelWorksheet)workbook.easy_getSheetAt(0)).easy_getExcelTable();

            // Add data in cells for report header
            for (int column=0; column<5; column++)
                xlsFirstTable.easy_getCell(0,column).setValue("Column " + (column + 1));

            // Add data in cells for report values
            for (int row=0; row<25; row++)
                for (int column=0; column<5; column++)
                    xlsFirstTable.easy_getCell(row+1,column).setValue("Data " + (row + 1) + ", " + (column + 1));

            // Set column widths
            xlsFirstTable.setColumnWidth(0, 70);
            xlsFirstTable.setColumnWidth(1, 100);
            xlsFirstTable.setColumnWidth(2, 70);
            xlsFirstTable.setColumnWidth(3, 100);
            xlsFirstTable.setColumnWidth(4, 70);

            // Group rows and format A1:E26 cell range
            ExcelDataGroup xlsFirstDataGroup = new ExcelDataGroup("A1:E26", DataGroup.GROUP_BY_ROWS, false);
            xlsFirstDataGroup .setAutoFormat(new ExcelAutoFormat(EasyXLS.Constants.Styles.AUTOFORMAT_EASYXLS1));
            ((ExcelWorksheet)workbook.easy_getSheetAt(0)).easy_addDataGroup(xlsFirstDataGroup );

            // Group rows and format A2:E10 cell range, outline level two, inside previous group
            ExcelDataGroup xlsSecondDataGroup = new ExcelDataGroup("A2:E10", DataGroup.GROUP_BY_ROWS, false);
            xlsSecondDataGroup.setAutoFormat(new ExcelAutoFormat(EasyXLS.Constants.Styles.AUTOFORMAT_EASYXLS2));

            // Export Excel file
            System.out.println("Writing file: C:\\Samples\\Tutorial17 - group data in Excel.xlsx");
            workbook.easy_WriteXLSXFile("C:\\Samples\\Tutorial17 - group data in Excel.xlsx");

            // Confirm export of Excel file
            if (workbook.easy_getError().equals(""))
                System.out.println("File successfully created.");
                System.out.println("Error encountered: " + workbook.easy_getError());

            // Dispose memory
        catch (Exception ex) {

EasyXLS Excel libraries:

Excel Library for Java
full Java version to import, export or convert Excel files
Excel Writer for Java
Java version to create and export Excel files
Download EasyXLS™ Excel Library for Java

File formats:

Office 365
MS Excel 2021 - 2024
MS Excel 2007 - 2019
MS Excel 97 - 2003