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Delete the First Child of the Root Node
Posted on: August 24, 2008 at 12:00 AM

In this section, you well learn how to delete the first child of the root node.

Delete the First Child of the Root Node

This Example describes a method to Delete the first child of the Root node .Methods which are used for Deleting the child of the root node in a DOM tree are described below :-

Element root = doc.getDocumentElement():- Allows direct access to the root of the DOM document.

root.removeChild():-This method removes the Child node.

 Xml code for the program generated is:-

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

<Company>
    <Location>
        <Companyname>Roseindia .Net</Companyname>
        <Employee>Girish Tewari</Employee>
    </Location>
</Company>

Deletefirstchild.java

/* 

         * @Program that Delete the First Child of the Root Node

         * Deletefirstchild.java 

         * Author:-RoseIndia Team

         * Date:-09-Jun-2008

         */

        

        import java.io.*;

        import javax.xml.parsers.*;

        import org.w3c.dom.*;

        

        public class Deletefirstchild {

        

          public static void main(String[] args) throws Exception {

          boolean validating = false;

          DocumentBuilderFactory factory = 

  DocumentBuilderFactory.newInstance();

          factory.setValidating(validating);

          Document doc = factory.newDocumentBuilder().parse(

  new File("Document4.xml"));

          new Deletefirstchild().deleteFirstElement(doc);

          }

        

          public void deleteFirstElement(Document doc) {

          Element root = doc.getDocumentElement();

          //returns the first child of the Root

          //Node child = root.getFirstChild();

          System.out.println("Length of root before deleting node is:"+

  root.getChildNodes().getLength());

         // Deletes the First Child of the Root Node

          root.removeChild(root.getFirstChild());

         System.out.println("Length of root after deleting node is:"+

  root.getChildNodes().getLength());

          

          }

        }

Output of the program

Length of root before deleting node is: 3
Length of root after deleting node is: 2

Download Source Code

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