Java8 interface static methods

public interface DAOFactory {

    default PersonFileDAO getPersonFileDAO() {
        return null;
    }

    default PersonDatabaseDAO getPersonDatabaseDAO() {
        return null;
    }
}

public class ConcreteDAOFactory implements DAOFactory {

    @Override
    public PersonFileDAO getPersonFileDAO() {
        return new PersonFileDAO();
    }

    @Override
    public PersonDatabaseDAO getPersonDatabaseDAO() {
        return new PersonDatabaseDAO();
    }

}