How to protect cells and sheet elements in Java

package testexceljava;

import java.awt.Color;
import EasyXLS.*;
import EasyXLS.Constants.*;

/* ---------------------------------------------------------------
 | Tutorial 06
 | 
 | This code sample shows how to create an Excel file in Java with
 | multiple sheets. The first sheet is protected and 
 | filled with data. The cells are formatted and locked.
 * ------------------------------------------------------------ */

public class Tutorial06 {

    public static void main(String[] args) {
        try {
            System.out.println("Tutorial 06");
            System.out.println("----------");

            // Create an instance of the class that creates 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");

            // Protect first sheet
            workbook.easy_getSheetAt(0).setSheetProtected(true);

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

            // Create the formatting style for the header
            ExcelStyle xlsStyleHeader = new ExcelStyle("Verdana", 8, true, true, Color.YELLOW);
            xlsStyleHeader.setBackground(Color.BLACK);
            xlsStyleHeader.setBorderColors(Color.GRAY, Color.GRAY, Color.GRAY, Color.GRAY);
            xlsStyleHeader.setBorderStyles(Border.BORDER_MEDIUM, Border.BORDER_MEDIUM, 
                                                Border.BORDER_MEDIUM, Border.BORDER_MEDIUM);
            xlsStyleHeader.setHorizontalAlignment(Alignment.ALIGNMENT_CENTER);
            xlsStyleHeader.setVerticalAlignment(Alignment.ALIGNMENT_BOTTOM);
            xlsStyleHeader.setWrap(true);
            xlsStyleHeader.setDataType(DataType.STRING);

            // 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).setStyle(xlsStyleHeader);
            }
            xlsFirstTable.easy_getRowAt(0).setHeight(30);

            // Add data in cells for report values
            for (int row=0; row<100; row++)
            {
                for (int column=0; column<5; column++)
                {
                    xlsFirstTable.easy_getCell(row+1, column).setValue("Data " + (row + 1) + ", " + (column + 1));
                }
            }

            // Create a formatting style for cells
            ExcelStyle xlsStyleData = new ExcelStyle();
            xlsStyleData.setHorizontalAlignment(Alignment.ALIGNMENT_LEFT);
            xlsStyleData.setForeground(Color.LIGHT_GRAY);
            xlsStyleData.setWrap(false);
            xlsStyleData.setDataType(DataType.STRING);
            // Protect cells
            xlsStyleData.setLocked(true);
            xlsFirstTable.easy_setRangeStyle("A2:E101", xlsStyleData);

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

            // Create Excel file
            System.out.println("Writing file: C:\\Samples\\Tutorial06 - protect Excel sheet.xlsx");
            workbook.easy_WriteXLSXFile("C:\\Samples\\Tutorial06 - protect Excel sheet.xlsx");

            // Confirm the creation 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();
        }
    }
}