Updating XML document using DOM only updates in memory

Question

I am trying to update an element value but it only gets updated in the memory and displayed. It does not physically change the xml document when I look after running the program.
Here is the code I am trying to run :
Please let me know what I am doing wrong.
static private Document findReplace(Document document, String elementName,
String valueToFind, String valueToReplace)
int i;
int k;
NodeList children;
Element docRoot= document.getDocumentElement(); // get root
NodeList elements = docRoot.getElementsByTagName(elementName);
if (elements !=null)
     for (i=0;i<elements.getLength(); i++)
     if (elements.item(i).hasChildNodes())
     children = elements.item(i).getChildNodes();
for(k=0;k<children.getLength(); k++)
          if (children.item(k).getNodeType() ==
               org.w3c.dom.Node.TEXT_NODE){
          if(children.item(k).getNodeValue().equals(valueToFind))
     children.item(k).setNodeValue(valueToReplace);
Thanks !

Answer 1

Document document;
               TransformerFactory tFactory =
                TransformerFactory.newInstance();
               Transformer transformer = tFactory.newTransformer();
               DOMSource source = new DOMSource(document);
               StreamResult result = new StreamResult(new File
               (c:/output/outputXml.xml));
               transformer.transform(source, result);