JTable - How to force user to select exactly one row

Question

I have to implement a JTable in which exactly one row has to be selected (always). Empty selection is not allowed. I'm selecting the first row during initialization:

table.setRowSelectionInterval(0, 0);

additionally, I'm using

table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

But user can still deselect one row using CLick + Ctrl.

What is the easiest way ensure, that one (exaclty) row is always selected in the table ?

Answer 1

If you have a JTable instance created, just use:

jTable1.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

Answer 2

Now, you could add MouseListeners, SelectionListeners, KeyListeners and key bindings to try and solve this is issue. Or, you could go to the heart of the problem.

The ListSelectionModel is responsible for managing the selection details.

You could simply supply your own ListSelectionModel for the row selection

public class ForcedListSelectionModel extends DefaultListSelectionModel {

    public ForcedListSelectionModel () {
        setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    }

    @Override
    public void clearSelection() {
    }

    @Override
    public void removeSelectionInterval(int index0, int index1) {
    }

}

And simply set it to your table...

table.setSelectionModel(new ForcedListSelectionModel());