Accessing different types of DOM tree nodes : DOM Tree « XML « Java Tutorial

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Attr;
import org.w3c.dom.CharacterData;
import org.w3c.dom.Comment;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;

public class Main {
  public static void main(String[] argv) throws Exception {
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder loader = factory.newDocumentBuilder();
    Document document = loader.parse("sample.xml");
    Element purchaseOrder = document.getDocumentElement();
    printElement(purchaseOrder, "");
  static void printElement(Element element, String indent) {
    System.out.println("Element '" + element.getNodeName() + "'");
    NodeList children = element.getChildNodes();
    for (int i = 0; i < children.getLength(); i++) {
      Node child = children.item(i);
      switch (child.getNodeType()) {
      case Node.ELEMENT_NODE:
        printElement((Element) child, indent + "\t");
      case Node.ATTRIBUTE_NODE:
        Attr attr = (Attr) child;
        System.out.println("\tAttribute: '" + attr.getName() + "' = '" + attr.getValue() + "'");
      case Node.COMMENT_NODE:
        Comment comment = (Comment) child;
        System.out.println("\tComment: '" + comment.getData() + "'");
      case Node.CDATA_SECTION_NODE:
        CharacterData cdata = (CharacterData) child;
        System.out.println("\tCDatat: '" + cdata.getData() + "'");
      case Node.TEXT_NODE:
        Text text = (Text) child;
        System.out.println("\tText: '" + text.getData() + "'");
        System.out.println("\tUnknown node type: '" + child.getNodeType() + "'");

33.4.DOM Tree
33.4.1.Creating a new DOM tree
33.4.2.Create new DOM tree with fully qualified element names
33.4.3.Custom complex filters for selecting nodes
33.4.4.Traverse the DOM tree as a list
33.4.5.Traverse the DOM tree using TreeWalker
33.4.6.Accessing different types of DOM tree nodes
33.4.7.Reading a DOM tree from XML document
33.4.8.Using ranges in DOM tree
33.4.9.Copying a Subtree of Nodes in a DOM Document
33.4.10.Copying a Subtree of Nodes from One DOM Document to Another
33.4.11.Get this Document's root node
33.4.12.Generates a DOM from scratch. Writes the DOM to a String using an LSSerializer.
33.4.13.Print Tree node
33.4.14.Traverse a DOM tree in order to print a document that is parsed