How to verify the DOM (Document Object Model) implementation class information?

If you want to verify the DOM (Document Object Model) implementation class information, you can try the following example program:

// Copyright (c) 2017 FYIcenter.com
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Text;

public class DomClassInfo {
   public static void main(String[] args) throws Exception {
      DocumentBuilderFactory f = DocumentBuilderFactory.newInstance();
      DocumentBuilder b = f.newDocumentBuilder();
      Document d = b.newDocument();
      
      Element e = d.createElement("Msg"); 
      Text t = d.createTextNode("Hello World!");
      e.appendChild(t);
      d.appendChild(e);
      
      System.out.println("DOM class info:");
      System.out.println("   Factory: "+f.getClass().getName());
      System.out.println("   Builder: "+b.getClass().getName());
      System.out.println("   Document: "+d.getClass().getName());
      System.out.println("   Element: "+e.getClass().getName());
      System.out.println("   TextNode: "+t.getClass().getName());
   }
}

Compile and test it:

>\fyicenter\jdk-1.8.0\bin\javac DomClassInfo.java

>\fyicenter\jdk-1.8.0\bin\java DomClassInfo
DOM class info:
   Factory: com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl
   Builder: com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl
   Document: com.sun.org.apache.xerces.internal.dom.DocumentImpl
   Element: com.sun.org.apache.xerces.internal.dom.ElementImpl
   TextNode: com.sun.org.apache.xerces.internal.dom.TextImpl

The output tells you that the default implementation of DOM in Java SE 8 JDK is the Apache Xerces package.

 

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