Java how to parse/Read XML file _java

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XML file

<?xml version= "1.0"?> 
<students> 
  <student> 
    <name>John</name> 
    < grade>b</grade> 
    <age>12</age> 
  </student> 
  <student> 
    <name >Mary</name> 
    <grade>A</grade> 
    <age>11</age> 
  </student> 
  <student> 
    <name>Simon</name> 
    <grade>A</grade> 
    <age>18 </age> 
  </student> 
</students>

Java Code:

Package net.viralpatel.java.xmlparser;  
Import Java.io.File;  
Import Javax.xml.parsers.DocumentBuilder;  
  
Import Javax.xml.parsers.DocumentBuilderFactory;  
Import org.w3c.dom.Document;  
Import org.w3c.dom.Element;  
Import Org.w3c.dom.Node;  
  
Import org.w3c.dom.NodeList; public class Xmlparser {public void Getallusernames (String fileName) {try {documentbuilderfactory  
      DBF = Documentbuilderfactory.newinstance ();  
      Documentbuilder db = Dbf.newdocumentbuilder ();  
      File File = new file (fileName);  
        if (file.exists ()) {Document doc = db.parse (file);  
  
        Element Docele = Doc.getdocumentelement (); Print root element of the document SYSTEM.OUT.PRINTLN ("root element of the document:" + Docele.)  
  
        Getnodename ());  
  
        NodeList studentlist = docele.getelementsbytagname ("student"); Print total student elements in document System.out. println ("Total Students:" + studentlist.getlength ()); if (studentlist!= null && studentlist.getlength () > 0) {for (int i = 0; i < Studentlist.getlen Gth ();  
  
            i++) {Node node = Studentlist.item (i); if (node.getnodetype () = = Node.element_node) {System.out. println ("===============  
  
              ======");  
              Element e = (element) node;  
              NodeList nodelist = e.getelementsbytagname ("name"); System.out.println ("Name:" + nodelist.item (0). Getchildnodes (). Item (0). GetNode  
  
              Value ());  
              NodeList = E.getelementsbytagname ("Grade"); System.out.println ("Grade:" + nodelist.item (0). Getchildnodes (). Item (0). Getnod  
  
              Evalue ());  
              NodeList = E.getelementsbytagname ("Age"); System.out.println ("Age:" + NodelIst.item (0). Getchildnodes (). Item (0). Getnodevalue ());  
        }} else {system.exit (1);  
    catch (Exception e) {System.out.println (e);  
    } public static void Main (string[] args) {xmlparser parser = new Xmlparser ();  
  Parser.getallusernames ("C:\\test.xml");  }  
}

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