instanceof

[tina sani]

I have Employee class and "Managers" and "Technicals" as two sub classes of
Employee.
Bob is instance of sub class Technical, how can I get like this:

If Bob instance of Technicals, then do something:

            OntClass mgr = model.getOntClass(ns + "Managers");
             OntClass  tech = model.getOntClass(ns + "Technicals");

            OntClass emp = model.getOntClass(ns + "Employee");
            Individual ind = tech.createIndividual(ns + "Bob");

I am trying like below but it flush an error message.

 if (ind instanceof tech){}