How to parse XML using DOM parser using java

class Student{
		String id;
		String firstName;
		String lastName;

		@Override
		public String toString() {
			return firstName+" "+lastName;
		}
	}

//Get the DOM Builder Factory
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

//Get the DOM Builder
DocumentBuilder builder = factory.newDocumentBuilder();

//Load and Parse the XML document
//document contains the complete XML as a Tree.
Document document = builder.parse(new File("/xml/student.xml"));

	List studentList = new ArrayList<>();
		//Iterating through the nodes and extracting the data.
		NodeList nodeList = document.getDocumentElement().getChildNodes();
		for (int i = 0; i < nodeList.getLength(); i++) {
			//We have encountered an  tag.
			Node node = nodeList.item(i);
			if (node instanceof Element) {
				Student student = new Student();
				student.id = node.getAttributes().getNamedItem("id").getNodeValue();
				NodeList childNodes = node.getChildNodes();
				for (int j = 0; j < childNodes.getLength(); j++) {
					Node cNode = childNodes.item(j);
					//Identifying the child tag of student encountered.
					if (cNode instanceof Element) {
						String content = cNode.getLastChild().getTextContent().trim();
						switch (cNode.getNodeName()) {
							case "firstName":
								student.firstName = content;
								break;
							case "lastName":
								student.lastName = content;
								break;
						}
					}
				}
				studentList.add(student);
			}

  
    John
    Carter
  
  
    Adam
    Davis
  
  
    Maak
    Cruise