Simple example of class assertions in OWL using Jena

EmployeeExample.java

package examples;

import com.hp.hpl.jena.ontology.*;
import com.hp.hpl.jena.rdf.model.*;

public class EmployeeExample
{
    public static final String ONT1 = "http://example.com/ontologies/ont1#";
    public static final String ONT2 = "http://example.com/ontologies/ont2#";

    private OntClass ont1Employee;
    private OntClass ont2Employee;
    private Individual john;

    public static void main( String[] args ) {
        new EmployeeExample().run();
    }

    public void run() {
        System.out.println( "Baseline model - no inference" );
        OntModel m = resetBaseModel( false );
        printDescription( john );

        System.out.println( "\nModel with inference" );
        m = resetBaseModel( true );
        printDescription( john );

        System.out.println( "\nont1:Employee rdfs:subClassOf ont2:Employee" );
        m = resetBaseModel( true );
        ont1Employee.addSuperClass( ont2Employee );
        printDescription( john );

        System.out.println( "\nont2:Employee rdfs:subClassOf ont1:Employee" );
        m = resetBaseModel( true );
        ont1Employee.addSubClass( ont2Employee );
        printDescription( john );

        System.out.println( "\nont2:Employee owl:sameAs ont1:Employee" );
        m = resetBaseModel( true );
        ont1Employee.addEquivalentClass( ont2Employee );
        printDescription( john );
    }

    private OntModel resetBaseModel( boolean withInference ) {
        OntModelSpec spec = withInference ? OntModelSpec.OWL_MEM_MICRO_RULE_INF : OntModelSpec.OWL_MEM;

        OntModel m = ModelFactory.createOntologyModel( spec );
        m.setNsPrefix( "ont1", ONT1 );
        m.setNsPrefix( "ont2", ONT2 );

        ont1Employee = m.createClass( ONT1 + "Employee" );
        ont2Employee = m.createClass( ONT2 + "Employee" );
        john = m.createIndividual( ONT1 + "john", ont1Employee );

        return m;
    }

    private void printDescription( Resource r ) {
        System.out.println( r.getURI() + " has properties:" );
        for (StmtIterator i = r.listProperties(); i.hasNext(); ) {
            Statement s = i.next();
            System.out.println( "  " + r.getModel().shortForm( s.getPredicate().getURI() ) +
                                " = " + r.getModel().shortForm( s.getObject().toString() ));
        }
    }
}

output.txt

Baseline model - no inference
http://example.com/ontologies/ont1#john has properties:
  rdf:type = ont1:Employee

Model with inference
http://example.com/ontologies/ont1#john has properties:
  rdf:type = ont1:Employee
  rdf:type = owl:Thing

ont1:Employee rdfs:subClassOf ont2:Employee
http://example.com/ontologies/ont1#john has properties:
  rdf:type = ont1:Employee
  rdf:type = ont2:Employee
  rdf:type = owl:Thing

ont2:Employee rdfs:subClassOf ont1:Employee
http://example.com/ontologies/ont1#john has properties:
  rdf:type = ont1:Employee
  rdf:type = owl:Thing

ont2:Employee owl:sameAs ont1:Employee
http://example.com/ontologies/ont1#john has properties:
  rdf:type = ont1:Employee
  rdf:type = ont2:Employee
  rdf:type = owl:Thing