خواندن فایل xml در جاوا (Read XML File)

<?xml version="1.0"?>
<class>
   <student rollno="393">
      <firstname>dinkar</firstname>
      <lastname>kad</lastname>
      <nickname>dinkar</nickname>
      <marks>85</marks>
   </student>
   <student rollno="493">
      <firstname>Vaneet</firstname>
      <lastname>Gupta</lastname>
      <nickname>vinni</nickname>
      <marks>95</marks>
   </student>
   <student rollno="593">
      <firstname>jasvir</firstname>
      <lastname>singn</lastname>
      <nickname>jazz</nickname>
      <marks>90</marks>
   </student>
</class>

public static void main(String[] args){

                try {  
                   File inputFile = new File("xmlfile.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("\nCurrent 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
                            .getElementsByTagName("marks")
                            .item(0)
                            .getTextContent());
                      }
                   }
                } catch (Exception e) {
                   e.printStackTrace();
                }
             }

File inputFile = new File("xmlfile.xml");

                 DocumentBuilderFactory dbFactory
                      = DocumentBuilderFactory.newInstance();
                   DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
                   Document doc = dBuilder.parse(inputFile);

Root element :class
----------------------------
Current Element :student
Student roll no : 393
First Name : dinkar
Last Name : kad
Nick Name : dinkar
Marks : 85
Current Element :student
Student roll no : 493
First Name : Vaneet
Last Name : Gupta
Nick Name : vinni
Marks : 95
Current Element :student
Student roll no : 593
First Name : jasvir
Last Name : singn
Nick Name : jazz
Marks : 90