Last JCheckBox stays toggled when firing changes in my JTable

Question

I have a table model containing elements of type JCheckBox. I want the content of this table to be different according to the value of a JComboBox.

My problem is the following : if I toggle a few checkboxes and then change the value of my combo box, all the check boxes take the default value (this is what I want, because the boolean values are those of the selected item in the JCheckBox) except the last one I toggled before changing the value of the combo box.

And here is how I implemented this :

public class ValsSelectionTableModel extends MyAbstractTableModel {

    private final JComboBox<Data> dataField;
    private final Map<Data, JCheckBox[][]> modifiedVals = new HashMap<>();

    @Override
    public Object getValueAt(int rowIndex, int columnIndex) {
        Data data = (Data) dataField.getSelectedItem();
        if (!modifiedVals.containsKey(data))
            modifiedVals.put(data,
                buildCheckBoxesFrom(ClassWithStaticFields.defaultBoolArray));
        return modifiedVals.get(data)[rowIndex][columnIndex];
    }

    private JCheckBox[][] buildCheckBoxesFrom(boolean[][] boolArray) {
        JCheckBox[][] checkBoxArray = 
            new JCheckBox[boolArray.length][boolArray[0].length];
        for (int i = 0 ; i < checkBoxArray.length ; i++)
            for (int j = 0 ; j < checkBoxArray[i].length ; j++) {
                checkBoxArray[i][j] = new JCheckBox();
                checkBoxArray[i][j].setSelected(boolArray[i][j]);
                checkBoxArray[i][j].setHorizontalAlignment(SwingConstants.CENTER);
            }
        return checkBoxArray;
    }
}

Has anyone got an idea what's wrong with this ?

EDIT : I forgot something important (otherwise the JComboBox selection would not change the display) : I added this actionListener to my JComboBox :

public class MyListener implements ActionListener {

    private final ValsSelectionTableModel tableModel;

    public MyListener(ValsSelectionTableModel tableModel) {
        this.tableModel = tableModel;
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        tableModel.fireTableDataChanged();
    }
}

Answer 1

Manage elements of type Boolean in your TableMode to get the default renderer and editor.

I already tried with Boolean, but the rendered checkboxes cannot be toggled.

Your implementation of TableMode appears to extend AbstractTableModel; ensure that the following things happen for the relevant column:

• Return Boolean.class from getColumnClass().

• Return true from isCellEditable().

• Fire the appropriate TableModelEvent in setValueAt() when updating your internal Map<…>.

Complete examples using AbstractTableModel are seen here and here. An example of adding multiple components to a column is examined here.