PLEASE HELP-JTable cell editor-change one cell, changes all cells of column

Question

for example i have 3 rows 4 columns, column 3 and 4 are dates. now if i change the date to a new value (eg for of column 3)
for any row, and then i click on any other cell. All cell values ie all rows for that column are changed to that new value.
ie it changed column 3 for all rows 1, 2 and 3 to that new value which i changed in only one cell of that column.
PLEASE HELP me , tell me what change i make to the code to fix it ....
this is my cell renderer for date
class DateCellRenderer extends JbcDateTimeChooser implements TableCellRenderer {
  protected Border m_noFocusBorder;
  public DateCellRenderer() {
    super();
    setStylePattern(JbcDateTimeChooser.MEDIUM);
    m_noFocusBorder = new EmptyBorder(1, 2, 1, 2);
    setOpaque(true);
    setBorder(m_noFocusBorder);
  public Component getTableCellRendererComponent(JTable table,
   Object value, boolean isSelected, boolean hasFocus,
   int row, int column)
  if(value instanceof Date) {
      Date b = (Date)value;
      setDate(b);
    setFont(table.getFont());
    setBorder(hasFocus ? UIManager.getBorder(
      "Table.focusCellHighlightBorder") : m_noFocusBorder);
    return this;
}I have this custom cell editor date
class DateCellEditor extends AbstractCellEditor implements TableCellEditor {
  protected JbcDateTimeChooser editor;
  public DateCellEditor() {
    super();
    editor = new JbcDateTimeChooser();
    editor.setStylePattern(JbcDateTimeChooser.MEDIUM);
  public Object getCellEditorValue() {
    return editor.getDate();
  public Component getTableCellEditorComponent(JTable table,
   Object value, boolean isSelected, int row, int column)
    if(value instanceof Date) {
      editor.setDate((Date)value);
    return editor;
}and this is how i defined in jtable
    lnnTableModel = new CellSiteLNNTableModel();
    lnnTable.setModel(lnnTableModel);
    lnnTableModel.addColumn("ABC");
    lnnTableModel.addColumn("DEF");
    lnnTableModel.addColumn("Date From");
    lnnTableModel.addColumn("Date To");
    for(int k = 0; k < lnnTableModel.getColumnCount(); k++) {
      TableColumn col = lnnTable.getColumn(lnnTableModel.getColumnName(k));
      TableCellRenderer renderer;
        DefaultTableCellRenderer textRenderer = new DefaultTableCellRenderer();
        renderer = textRenderer;
      TableCellEditor editor;
      JTextField textColumn = new JTextField();
      if((k == CellSiteLNN.DATE_FROM) || (k == CellSiteLNN.DATE_TO)) {
        editor = new DateCellEditor();  //  this is the cell editor
     renderer = new DateCellRenderer(); // this is the assigned cell renderer
      } else {
        editor = new DefaultCellEditor(textColumn);
      col.setCellRenderer(renderer);
      col.setCellEditor(editor);
    }

Answer 1

table model is extended from AbstractTableModel
and have these methods
do you see anything wrong here.....
  public Object getValueAt(int row, int column) {
    Vector rowVector = (Vector)dataVector.elementAt(row);
    return rowVector.elementAt(column);
  public void setValueAt(Object aValue, int row, int column) {
    Vector rowVector = (Vector)dataVector.elementAt(row);
    rowVector.setElementAt(aValue, column);
    // generate notification
    fireTableChanged(new TableModelEvent(this, row, row, column));
  } // end method (setValueAt)