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Change a particular node in XML

import java.io.File; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import javax.xml.xpath.XPath; import javax.xml.xpath.XPathConstants; import javax.xml.xpath.XPathFactory; import org.w3c.dom.Document; import org.w3c.dom.NodeList; import org.xml.sax.InputSource; public class Main {   public static void main(String[] args) throws Exception {     Document doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(         new InputSource("data.xml"));     XPath xpath = XPathFactory.newInstance().newXPath();     NodeList nodes = (NodeList) xpath.evaluate("//employee/name[text()='old']", doc,         XPathConstants.NODESET);     for (int idx = 0; idx < nodes.getLength(); idx++) {       nodes.item(idx).setTextContent("new value");     }     Transformer xformer = TransformerFactory.newInstance().newTransformer();     xformer.transform(new DOMSource(doc), new StreamResult(new File("data_new.xml")));   } }