Abstract class, Interface and two models issue

Question

Hi!
I will post my code and then ask the question (text between code snippets is bold, so you don't miss it, it's not shouting):
public class AppScreen extends JFrame
                       implements ActionListener {
  private MemoryTableModel model;
  public AppScreen() {
    this.model = new MemoryTableModel();
       //code
  public void actionPerformed(ActionEvent actEvt) {
      if(table.getSelectedRow() != -1) {
        model.deleteRow(table.getSelectedRow());
      else {
        ErrDialog.noRowErr();
  public MemoryTableModel getModel() {
    return model;
public class MemoryTableModel extends BasicTableModel
                              implements MemoryTableInterface {
  public MemoryTableModel() {
    //code
  public synchronized void insertRow(String file, String time) {
    //code
  public synchronized void editRow(int selectedRow, String file, String time) {
    //code
public synchronized void deleteRow(int selectedRow) {
    //code
public abstract class BasicTableModel extends AbstractTableModel {
  private final String FILE_COLUMN = "Executable file";
  private final String TIME_COLUMN = "Time";
  protected String[] columnNames   = new String[2];
  protected List<RowRecord> data   = new ArrayList<RowRecord>();
  BasicTableModel() {
    //code
  public int getColumnCount() {
    //code
  public int getRowCount() {
    //code
  public String getValueAt(int row, int col) {
    //code
  public Class<? extends String> getColumnClass(int c) {
    //code
  public String getColumnName(int col) {
    //code
  public List<RowRecord> getData() {
    //code
  public int getTimeColumn() {
    //code
  public int getFileColumn() {
    //code
public interface MemoryTableInterface {
  public void insertRow(String file, String time);
  public void editRow(int selectedRow, String file, String time);
  public void deleteRow(int selectedRow);
In this form, everything works fine. But now, I would like to choose between two models at the start, so I thought I would do this:
public class AppScreen extends JFrame
                       implements ActionListener {
  private BasicTableModel model;
  public AppScreen() {
    if(...) {
      this.model = new MemoryTableModel();
    else {
      this.model = new JDBCTableModel();
public void actionPerformed(ActionEvent actEvt) {
      if(table.getSelectedRow() != -1) {
        model.deleteRow(table.getSelectedRow());
      else {
        ErrDialog.noRowErr();
  public BasicTableModel getModel() {
    return model;
public class JDBCTableModel extends BasicTableModel
                            implements JDBCTableInterface {
  public JDBCTableModel(Connection conn)
    throws ClassNotFoundException, SQLException {
    //code
  public void insertRow(String file, String time) throws SQLException {
    //code
  public void editRow(int selectedRow, String newFile, String newTime)
      throws SQLException {
    //code
  public void deleteRow(int selectedRow) throws SQLException {
    //code
public interface JDBCTableInterface {
  public void insertRow(String file, String time) throws SQLException;
  public void editRow(int selectedRow, String file, String time)
      throws SQLException;
  public void deleteRow(int selectedRow) throws SQLException;
}But I'm getting error message from AppScreen that method deleteRow(int) is undefined for the type BasicTableModel. I thought if I initialize variable model as some implementation of BasicTableModel, it will be OK. Apparently it's not, so:
where and what am I missing or
how can I realize this choosing between two models so I don't have to write "if(model == MemoryModel) else if(model == JDBCModel)" around every method where I have to decide.
Thanks!

Answer 1

I would like to have issues interfacing with two classy models, as well. ;-)
You need to have your BasicTobleModel class implement your JDBCTableInterface interface (even if it doesn't implement those methods itself), if that is how you intend to use that class.
Edit: Too slow.