Populate Data ke JComboBox

public void getDoctorData() {
        DoctorService doctorService = new DoctorService();
        List<Doctor> list = doctorService.selectAll();        
        Vector vecModel = new Vector();
        
        for (Doctor doctor : list) {
            String name = doctor.getFirstname()+" "+doctor.getLastname();
            int id = doctor.getId();
            
            vecModel.addElement(new Doctor(id, name));
        }
        
        ComboBoxModel model = new DefaultComboBoxModel(vecModel);
        cmbDoctor.setModel(model);
    }

Service (ambil data)

// Select All Data
    public List<Doctor> selectAll() {
        Statement stmt = null;
        ResultSet rs = null;
        List<Doctor> doctors = new ArrayList<>();
        try {
            stmt = conn.createStatement();
            rs = stmt.executeQuery(selectAll);
            
            while (rs.next()) {
                Doctor doctor = new Doctor();
                
                doctor.setId(rs.getInt("uid"));
                doctor.setTitle(rs.getString("title"));
                doctor.setFirstname(rs.getString("firstname"));
                doctor.setLastname(rs.getString("lastname"));
                doctor.setSpecialist(rs.getString("specialist"));
                
                doctors.add(doctor);
            }
            
            return doctors;
            
       } catch (SQLException se) {
            se.printStackTrace();
            return null;
        }
    }