Java Reference
In-Depth Information
NodeList nl = e.getChildNodes();
for (int i = 0; i < nl.getLength(); i++)
{
Node node = nl.item(i);
if (node instanceof Element)
dump((Element) node);
}
}
}
DOMDemo
isdesignedtorunatthecommandline.Afterverifyingthatonecommand-
lineargument(thenameofanXMLdocument)hasbeenspecified,
main()
creates a
document builder factory, informs the factory that it wants a namespace-aware docu-
ment builder, and has the factory return this document builder.
Continuing,
main()
parsesthedocumentintoanodetree;outputstheXMLdeclara-
tion'sversionnumber,encoding,andstandaloneattributevalues;andrecursivelydumps
all element nodes (starting with the root node) and their attribute values.
Note
Regarding the multiple catch blocks, consider it an exercise to replace them
with multicatch.
Notice the use of
getNodeType()
in one part of this listing and
instanceof
in another part. The
getNodeType()
method call isn't necessary (it is only present
fordemonstration)because
instanceof
canbeusedinstead.However,thecastfrom
Node
type to
Element
type in the
dump()
method calls is necessary.
Assuming that you've compiled the source code, execute
java DOMDemo art-
icle.xml
to dump
Listing 10-3
'
s article XML content. You should observe the fol-
lowing output:
Version = 1.0
Encoding = null
Standalone = false
Element: article, article, null, null
Attribute lang = en
Attribute title = The Rebirth of JavaFX
Element: abstract, abstract, null, null
