Как получить данные из xml в Java?

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import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.w3c.dom.Element;
import java.io.File;

public class ReadXMLFile {

  public static void main(String argv[]) {

    try {
      File inputFile = new File("input.xml");
      DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
      DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
      Document doc = dBuilder.parse(inputFile);
      doc.getDocumentElement().normalize();
      System.out.println("Root element: " + doc.getDocumentElement().getNodeName());
      NodeList nList = doc.getElementsByTagName("student");
      System.out.println("----------------------------");
      for (int temp = 0; temp < nList.getLength(); temp++) {
        Node nNode = nList.item(temp);
        System.out.println("
Current Element :" + nNode.getNodeName());
        if (nNode.getNodeType() == Node.ELEMENT_NODE) {
          Element eElement = (Element) nNode;
          System.out.println("Student roll no : " 
             + eElement.getAttribute("rollno"));
          System.out.println("First Name : " 
             + eElement
             .getElementsByTagName("firstname")
             .item(0)
             .getTextContent());
          System.out.println("Last Name : " 
             + eElement
             .getElementsByTagName("lastname")
             .item(0)
             .getTextContent());
          System.out.println("Nick Name : " 
             + eElement
             .getElementsByTagName("nickname")
             .item(0)
             .getTextContent());
          System.out.println("Marks : " 
             + eElement
             .getElements