CODEWITHSUNDEEP
javaxml
Crystal
Crystal

Reputation: 29518

XML Parsing with Java, walking DOM tree

We are studying how to parse through the DOM tree in Java. Quick question, in the below partial code my prof gave us, he creates an ArrayList and adds the Document object to it. I've only used the ArrayList to add items to the list like String, int, etc. In this case, when he adds the Document object to it, does Java automatically put each Node into the list?

       DocumentBuilder docBuilder = 
           DocumentBuilderFactory.newInstance().newDocumentBuilder(); 

        Document doc = docBuilder.parse(f); 

        List<Node> nodeList = new ArrayList<Node>(); 
        nodeList.add(doc); 

        while(nodeList.size() > 0)

Thanks!

Upvotes: 2

Views: 1291

Answers (2)

duffymo
duffymo

Reputation: 309008

The right way to iterate through a Document is by starting with the root and recursively visiting each child node. There are a lot of ways to do it: depth first, breadth first, etc.

I don't see the value in adding the Document to a List, unless you're creating multiple Documents at the same time.

Upvotes: 0

skaffman
skaffman

Reputation: 403581

No. Document is a subtype of Node, so adding the Document to the List<Node> just adds that one object, not the child nodes of the document.

Upvotes: 1

Related Questions