How to set file properties for Excel file in Java

package testexceljava;

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

/* -------------------------------------------------------------------------
 | Tutorial 33
 |
 | This tutorial shows how to set document properties for Excel file in Java,
 | like 'Subject' property for summary information, 'Manager' property for
 | document summary information and a custom property.
 * ------------------------------------------------------------------------- */

public class Tutorial33 {

   public static void main(String[] args) {
       try {
          System.out.println("Tutorial 33");
          System.out.println("----------");

          // Create an instance of the class that exports Excel files
          ExcelDocument workbook = new ExcelDocument(1);

          // Set the 'Subject' document property
          workbook.getSummaryInformation().setSubject("This is the subject");

          // Set the 'Manager' document property
          workbook.getDocumentSummaryInformation().setManager("This is the manager");

          // Set a custom document property
          workbook.getDocumentSummaryInformation().setCustomProperty("PropertyName", FileProperty.VT_NUMBER, "4");

          // Export Excel file
          System.out.println("Writing file: C:\\Samples\\Tutorial33 - Excel file properties.xlsx");
          workbook.easy_WriteXLSXFile("C:\\Samples\\Tutorial33 - Excel file properties.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();
      }
   }
}