How to create a chart sheet in Java

package testexceljava;

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

/* -------------------------------------------------------
 | Tutorial 21
 |
 | This tutorial shows how to create an Excel file in Java
 | having a worksheet and a chart sheet.
 * ------------------------------------------------------- */

public class Tutorial21 {

    public static void main(String[] args) {
        try {
            System.out.println("Tutorial 21");
            System.out.println("----------");

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

            // Create a worksheet
            workbook.easy_addWorksheet("SourceData");

            // Get the table of data for the worksheet
            ExcelTable xlsTable1 = ((ExcelWorksheet)workbook.easy_getSheet("SourceData")).easy_getExcelTable();

            // Add data in cells for report header
            xlsTable1.easy_getCell(0, 0).setValue("Show Date");
            xlsTable1.easy_getCell(0, 1).setValue("Available Places");
            xlsTable1.easy_getCell(0, 2).setValue("Available Tickets");
            xlsTable1.easy_getCell(0, 3).setValue("Sold Tickets");

            // Add data in cells for chart report values
            xlsTable1.easy_getCell(1, 0).setValue("03/13/2005 00:00:00");
            xlsTable1.easy_getCell(1, 0).setFormat(EasyXLS.Constants.Format.FORMAT_DATE);
            xlsTable1.easy_getCell(2, 0).setValue("03/14/2005 00:00:00");
            xlsTable1.easy_getCell(2, 0).setFormat(EasyXLS.Constants.Format.FORMAT_DATE);
            xlsTable1.easy_getCell(3, 0).setValue("03/15/2005 10:00:00");
            xlsTable1.easy_getCell(3, 0).setFormat(EasyXLS.Constants.Format.FORMAT_DATE);
            xlsTable1.easy_getCell(4, 0).setValue("03/16/2005 00:00:00");
            xlsTable1.easy_getCell(4, 0).setFormat(EasyXLS.Constants.Format.FORMAT_DATE);

            xlsTable1.easy_getCell(1, 1).setValue("10000");
            xlsTable1.easy_getCell(2, 1).setValue("5000");
            xlsTable1.easy_getCell(3, 1).setValue("8500");
            xlsTable1.easy_getCell(4, 1).setValue("1000");

            xlsTable1.easy_getCell(1, 2).setValue("8000");
            xlsTable1.easy_getCell(2, 2).setValue("4000");
            xlsTable1.easy_getCell(3, 2).setValue("6000");
            xlsTable1.easy_getCell(4, 2).setValue("1000");

            xlsTable1.easy_getCell(1, 3).setValue("920");
            xlsTable1.easy_getCell(2, 3).setValue("1005");
            xlsTable1.easy_getCell(3, 3).setValue("342");
            xlsTable1.easy_getCell(4, 3).setValue("967");

            // Set column widths
            xlsTable1.easy_getColumnAt(0).setWidth(100);
            xlsTable1.easy_getColumnAt(1).setWidth(100);
            xlsTable1.easy_getColumnAt(2).setWidth(100);
            xlsTable1.easy_getColumnAt(3).setWidth(100);
            
            // Add a chart sheet
            workbook.easy_addChart("Chart", "=SourceData!$A$1:$D$5", Chart.SERIES_IN_COLUMNS);

            // Export Excel file
            System.out.println("Writing file: C:\\Samples\\Tutorial21 - chart sheet in Excel.xlsx");
            workbook.easy_WriteXLSXFile("C:\\Samples\\Tutorial21 - chart sheet in Excel.xlsx");

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

            // Dispose memory
            workbook.Dispose();
        }
        catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}