Access different types of DOM tree nodes in Java

    /*from  w w w  .j a v a2s  .c  om*/
import java.io.StringReader;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.CharacterData;
import org.w3c.dom.Attr;
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;
import org.xml.sax.InputSource;

public class Main {
  
  public static void main(String[] argv) throws Exception {
    StringReader sr = new StringReader("<tag>java2s.com</tag>");
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder loader = factory.newDocumentBuilder();

    Document document = loader.parse(new InputSource(sr));
    Element root = document.getDocumentElement();
    printElement(root, "");


  }
  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");
        break;
      case Node.ATTRIBUTE_NODE:
        Attr attr = (Attr) child;
        System.out.println("\tAttribute: '" + attr.getName() + "' = '" + attr.getValue() + "'");
        break;
      case Node.COMMENT_NODE:
        Comment comment = (Comment) child;
        System.out.println("\tComment: '" + comment.getData() + "'");
        break;
      case Node.CDATA_SECTION_NODE:
        CharacterData cdata = (CharacterData) child;
        System.out.println("\tCDatat: '" + cdata.getData() + "'");
        break;
      case Node.TEXT_NODE:
        Text text = (Text) child;
        System.out.println("\tText: '" + text.getData() + "'");
        break;
      default:
        System.out.println("\tUnknown node type: '" + child.getNodeType() + "'");
        break;
      }
    }
  }
}