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

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try {
  File inputFile = new File("input.xml");
  SAXParserFactory factory = SAXParserFactory.newInstance();
  SAXParser saxParser = factory.newSAXParser();
  UserHandler userhandler = new UserHandler();
  saxParser.parse(inputFile, userhandler);
} catch (Exception e) {
  e.printStackTrace();
}

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if (qName.equalsIgnoreCase("student")) {
  String rollNo = attributes.getValue("rollno");
  System.out.println("Roll No : " + rollNo);
} else if (qName.equalsIgnoreCase("firstname")) {
  bFirstName = true;
} else if (qName.equalsIgnoreCase("lastname")) {
  bLastName = true;
} else if (qName.equalsIgnoreCase("nickname")) {
  bNickName = true;
} else if (qName.equalsIgnoreCase("marks")) {
  bMarks = true;
}

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if (bFirstName) {
  System.out.println("First Name: "
      + new String(ch, start, length));
  bFirstName = false;
} else if (bLastName) {
  System.out.println("Last Name: "
      + new String(ch, start, length));
  bLastName = false;
} else if (bNickName) {
  System.out.println("Nick Name: "
      + new String(ch, start, length));
  bNickName = false;
} else if (bMarks) {
  System.out.println("Marks: "
      + new String(ch, start, length));
  bMarks = false;
}