How to group rows or columns in J#.NET

package Tutorial17;

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

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

public class Tutorial17
{

    public Tutorial17()
    {
    }

    /** @attribute System.STAThread() */
    public static void main(String[] args)
    {
        Console.WriteLine("Tutorial 17\n----------\n");

        // 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));
            xlsFirstTable.easy_getCell(0,column).setDataType(DataType.STRING);
        }
        xlsFirstTable.easy_getRowAt(0).setHeight(30);

        // 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));
                xlsFirstTable.easy_getCell(row+1,column).setDataType(DataType.STRING);
            }
        }

        // 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));
        ((ExcelWorksheet)workbook.easy_getSheetAt(0)).easy_addDataGroup(xlsSecondDataGroup);

        // Export Excel file
        Console.WriteLine("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
        String sError = workbook.easy_getError();
        if (sError.Equals(""))
            Console.Write("\nFile successfully created. Press Enter to Exit...");
        else
            Console.Write("\nError encountered: " + sError + "\nPress Enter to Exit...");

        // Dispose memory
        workbook.Dispose();

        Console.ReadLine();
    }
}