I have an XML document as follows:
Wha
Article
In the light of previous related questions, I'd like to repeat and stress the advice of others (like JB Nizet commented on this question):
Learn Java, learn XML, pick the tools and API's you need for your project and learn to use those too. If at one point you get into trouble, everybody here will be happy to help you out debugging your code.
I'm aware that this may seem harsh but it gets to the point where your program gets built by StackOverflow users and not yourself.
That being said, the link at the top of this answer leads to a tutorial on using JDOM to traverse your XML.