XML : I want to add xml declaration by using JDOM

My code is:-

import java.io.IOException;

import org.jdom2.Document;

import org.jdom2.output.Format;

import org.jdom2.output.XMLOutputter;

public class Test

{

  public static void main(String[] args)   {      Document doc = new Document();      XMLOutputter outputter = new XMLOutputter(Format.getPrettyFormat());      try {          //System.out.println(doc);        outputter.output(doc, System.out);             }      catch (IOException e) {        System.err.println(e);      }  }    

}

its output is:

My expectation is:

Thanks in advanced