Copy a Subtree of Nodes in a DOM Document in Java

import java.io.StringReader;
/*ww w . ja va 2s .  co m*/
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
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));
   
    NodeList list = document.getElementsByTagName("tag");
    Element element = (Element) list.item(0);

    Element dup = (Element) element.cloneNode(true);

    element.getParentNode().insertBefore(dup, element.getNextSibling());



  }
}