How to Make XML in JAVA

import java.io.StringWriter;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class Xml {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Xml xmlObj = new Xml();
        xmlObj.makeStudentXml();
    }

    private void makeStudentXml()
    {
        try{
            DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder docBuilder = docFactory.newDocumentBuilder();

            // root elements
            Document doc = docBuilder.newDocument();
            Element rootElement = doc.createElement("UniversityRecord");
            doc.appendChild(rootElement);


            // Adding 2 sample students in Student Element.
            for(int index=0; index<2; index++)
            {
                Element studentElement = doc.createElement("Student");
                rootElement.appendChild(studentElement);

                Element studentName = doc.createElement("Name");
                studentName.appendChild(doc.createTextNode("Hammad Hassan"));

                Element studentRollNo = doc.createElement("RollNo");
                studentRollNo.appendChild(doc.createTextNode("26"));

                Element studentClass = doc.createElement("Class");
                studentClass.appendChild(doc.createTextNode("Four"));

                // Adding all elements to Student.
                studentElement.appendChild(studentName);
                studentElement.appendChild(studentRollNo);
                studentElement.appendChild(studentClass);
            }

            // Now displaying the results of XML.
            TransformerFactory transformerFactory = TransformerFactory.newInstance();
            Transformer transformer = transformerFactory.newTransformer();
            DOMSource source = new DOMSource(doc);
            StringWriter writer = new StringWriter();

            transformer.transform(source, new StreamResult(writer) );
            String xmlResults = writer.getBuffer().toString().replaceAll("\n|\r", "");

            System.out.println(xmlResults);
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
    }

}
<?xml version="1.0" encoding="UTF-8"?>
<UniversityRecord>
   <Student>
      <Name>Hammad Hassan</Name>
      <RollNo>26</RollNo>
      <Class>Four</Class>
   </Student>
   <Student>
      <Name>Hammad Hassan</Name>
      <RollNo>26</RollNo>
      <Class>Four</Class>
   </Student>
</UniversityRecord>