Code is response to answers.semanticweb.com question at http://answers.semanticweb.com/questions/8497

schema.owl

<?xml version="1.0"?>
<rdf:RDF
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:owl="http://www.w3.org/2002/07/owl#"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
    xmlns="http://example.org/unnamed0#"
    xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
  xml:base="http://example.org/unnamed0">
  <owl:Ontology rdf:about="">
    <owl:versionInfo rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
    >Created with TopBraid Composer</owl:versionInfo>
  </owl:Ontology>
  <owl:Class rdf:ID="Uncle">
    <owl:intersectionOf rdf:parseType="Collection">
      <owl:Class rdf:ID="Brother"/>
      <owl:Class rdf:ID="Parent"/>
    </owl:intersectionOf>
    <rdfs:subClassOf>
      <owl:Class rdf:ID="Person"/>
    </rdfs:subClassOf>
  </owl:Class>
  <owl:Class rdf:about="#Parent">
    <rdfs:subClassOf>
      <owl:Class rdf:about="#Person"/>
    </rdfs:subClassOf>
  </owl:Class>
  <owl:Class rdf:about="#Person">
    <rdfs:subClassOf rdf:resource="http://www.w3.org/2002/07/owl#Thing"/>
  </owl:Class>
  <owl:Class rdf:about="#Brother">
    <rdfs:subClassOf rdf:resource="#Person"/>
  </owl:Class>
  <owl:DatatypeProperty rdf:ID="age">
    <rdfs:range rdf:resource="http://www.w3.org/2001/XMLSchema#integer"/>
    <rdfs:domain rdf:resource="#Person"/>
  </owl:DatatypeProperty>
  <owl:TransitiveProperty rdf:ID="knows">
    <rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
    >knows</rdfs:label>
    <rdfs:domain rdf:resource="#Person"/>
    <rdfs:range rdf:resource="#Person"/>
    <rdf:type rdf:resource="http://www.w3.org/2002/07/owl#SymmetricProperty"/>
  </owl:TransitiveProperty>
  <Uncle rdf:ID="UncleBob">
    <owl:sameAs>
      <Uncle rdf:ID="UncleRobert"/>
    </owl:sameAs>
    <knows>
      <Uncle rdf:ID="UncleSam">
        <knows>
          <Uncle rdf:ID="UncleTom"/>
        </knows>
      </Uncle>
    </knows>
  </Uncle>
</rdf:RDF>

<!-- Created with TopBraid -->

TesteProp.java

package testejena;

import com.hp.hpl.jena.ontology.OntClass;
import com.hp.hpl.jena.ontology.OntModel;
import com.hp.hpl.jena.rdf.model.ModelFactory;
import com.hp.hpl.jena.util.FileManager;
import com.hp.hpl.jena.util.iterator.ExtendedIterator;
import java.io.InputStream;
import java.util.Iterator;

public class TesteProp {

    static final String inputFileName = "schema.owl";

    public static void main(String args[]) {

        try {

            //create the reasoning model using the base
            OntModel inf = ModelFactory.createOntologyModel();

            // use the FileManager to find the input file
            InputStream in = FileManager.get().open(inputFileName);
            if (in == null) {
                throw new IllegalArgumentException("File: " + inputFileName + " not found");
            }

            inf.read(in, "");

            String URI = "http://example.org/unnamed0#";

            ExtendedIterator classes = inf.listClasses();
            while (classes.hasNext()) {
                OntClass essaClasse = (OntClass) classes.next();

                String vClasse = essaClasse.getLocalName().toString();

                if (essaClasse.hasSubClass()) {
                    System.out.println("Classe: " + vClasse);
                    OntClass cla = inf.getOntClass(URI + vClasse);
                    if( cla != null ) {
	                    for (Iterator i = cla.listSubClasses(); i.hasNext();) {
	                        OntClass c = (OntClass) i.next();
	                        System.out.print("   " + c.getLocalName() + " " + "\n");
	                    } // end for
                    } // end if
                }
            }
        } catch (Exception e) {
            System.out.println(e);
        }
    }
}

Code is response to answers.semanticweb.com question at http://answers.semanticweb.com/questions/8497