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problem in add element in xml file using java

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there is some problem in my application it is unable to add the element in my xml file plzzzzzz help me.
My java file is ------>
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class GeographyExample {

public static void main (String argv[]){
try {

File fl=new File("national.xml");
DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
Document doc = docBuilder.parse(fl);
System.out.println("###########" +nl);
int i = nl.getLength();
for(int j=0 ; j<i;j++){
Node n = nl.item(j);
//Node parent = n.getParentNode();
Element root = doc.createElement("countrythree");

System.out.println("----------------->>>>>>>>"+root+ "," +n.appendChild(root)+ "," +n);

}catch(Exception e)



my xml file is national.xml

<?xml version="1.0" encoding="UTF-8"?>

i am unable to add <couthrythree> in xml file

plzzzzzzzzz solve it
Author and all-around good cowpoke
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It looks to me like you have not made provision for writing out the modified XML document. You have modified the DOM in memory but that will not change the disk file automatically. The tools used to write a DOM depend on the Java version and/or outside toolkit you are using.
IF you have Java 1.4 or 1.5 - look at the javax.xml.transform package.
Any XML tutorial will have example code.
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