Java Reference
In-Depth Information
}
catch (IOException ioe)
{
System.err.println("IOE: "+ioe);
}
catch (SAXException saxe)
{
System.err.println("SAXE: "+saxe);
}
catch (FactoryConfigurationError fce)
{
System.err.println("FCE: "+fce);
}
catch (ParserConfigurationException pce)
{
System.err.println("PCE: "+pce);
}
}
}
After parsing
contacts.xml
and building the DOM tree,
main()
uses
Docu-
ment
's
getElementsByTagName()
methodtoreturna
NodeList
of
contact
element nodes. For each member of this list,
main()
extracts the
contact
element
node,andusesthisnodewith
getElementsByTagName()
toreturna
NodeList
of the
contact
element node's
city
element nodes.
For each member of the
cities
list,
main()
extracts the
city
element node,
andusesthisnodewith
getElementsByTagName()
toreturna
NodeList
ofthe
city
elementnode'schildnodes—thereisonlyasinglechildtextnodeinthisexample,
butthepresenceofacommentorprocessinginstructionwouldincreasethenumberof
childnodes.Forexample,
<city>Chicago<!--The windy city--></city>
increases the number of child nodes to 2.
Ifthechild'snodetypeindicatesthatitisatextnode,thechildnode'svalue(obtained
via
getNodeValue()
)isstoredinastringbuilder—onlyonechildnodeisstoredin
thestringbuilderinthisexample. Ifthebuilder'scontentsindicate that
Chicago
has
been found, the
chicago
flag is set to true and execution leaves the
cities
loop.
