Here is a code that accepts the data from the user through swing components and display it in xml file.

import java.io.*;
import java.util.*;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import org.w3c.dom.*;
import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.*;
import javax.xml.transform.stream.*;

public class CreateXML extends JFrame{
JButton ADD;
JPanel panel;
JLabel label1,label2,label3,label4;
final JTextField text1,text2,text3,text4;

public static void createXmlFile(Document doc,String name,String address,String contactNo,String email) throws Exception {
Element root = doc.createElement("Student");
doc.appendChild(root);
Element element1 = doc.createElement("Name");
root.appendChild(element1);
Text text1 = doc.createTextNode(name);
element1.appendChild(text1);

Element element2 = doc.createElement("Address");
root.appendChild(element2);
Text text2 = doc.createTextNode(address);
element2.appendChild(text2);

Element element3 = doc.createElement("ContactNo");
root.appendChild(element3);
Text text3 = doc.createTextNode(contactNo);
element3.appendChild(text3);

Element element4 = doc.createElement("Email");
root.appendChild(element4);
Text text4 = doc.createTextNode(email);
element4.appendChild(text4);

TransformerFactory factory = TransformerFactory.newInstance();
Transformer transformer = factory.newTransformer();
transformer.setOutputProperty(OutputKeys.INDENT, "yes");

StringWriter sw = new StringWriter();
StreamResult result = new StreamResult(sw);
DOMSource source = new DOMSource(doc);
transformer.transform(source, result);
String xmlString = sw.toString();

File file = new File("c:/student.xml");
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file,true)));
bw.write(xmlString);
bw.flush();
bw.close();
}
CreateXML(){
setLayout(null);
label1 = new JLabel();
label1.setText("Name:");
text1 = new JTextField(20);

label2 = new JLabel();
label2.setText("Address:");
text2 = new JTextField(20);

label3 = new JLabel();
label3.setText("Contact No:");
text3 = new JTextField(20);

label4 = new JLabel();
label4.setText("Email:");
text4 = new JTextField(20);

ADD=new JButton("ADD");

label1.setBounds(20,50,100,20);
text1.setBounds(140,50,100,20);

label2.setBounds(20,80,100,20);
text2.setBounds(140,80,100,20);

label3.setBounds(20,110,100,20);
text3.setBounds(140,110,100,20);

label4.setBounds(20,140,100,20);
text4.setBounds(140,140,100,20);
ADD.setBounds(140,200,100,20);

add(label1);
add(text1);
add(label2);
add(text2);
add(label3);
add(text3);
add(label4);
add(text4);
add(ADD);

ADD.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae){

String value1=text1.getText();
String value2=text2.getText();
String value3=text3.getText();
String value4=text4.getText();
try{
DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = builderFactory.newDocumentBuilder();
Document doc = docBuilder.newDocument();
createXmlFile(doc,value1,value2,value3,value4);
System.out.println("Xml File Created Successfully");
}
catch(Exception E){}
}
});
}
public static void main(String arg[]){
CreateXML frame=new CreateXML();
frame.setSize(300,300);
frame.setVisible(true);
}
}

Thanks Deepak..very informative.