They have a tutorial at: jena.apache.org/tutorials/sparql.html
Once you've done the Apache Jena CLI tools setup we can query all users with Full Name (FN) "John Smith" directly fom the rdf/vcard.ttl Turtle RDF file with the rdf/vcard.rq SPARQL query:
and that outputs:
sparql --data=rdf/vcard.ttl --query=rdf/vcard.rq
---------------------------------
| x |
=================================
| <http://somewhere/JohnSmith/> |
---------------------------------
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