Question

I have a JTable with the following columns:

rowNumber | Element | Quantity

And a JButton that adds rows every time it’s clicked. The column Element has a custom JComboBox cell editor that gets filled with elements from a database. However i need to do the following:

Suppose i have these elements in the JComboBox of the first row in my table:
Element1
Element2
Element3

I select Element2 from the JComboBox in the first row and then I proceed to add another row.
This new row must not show Element2 any more in its JComboBox. And the previous (first) row must not show the Element selected in the second row and so on.

Answer 1

I think it may help to know the expected cardinality of the Set<Element>. Accordingly, @mKorbel raises the important question of scalability, citing this related discussion. In that case, the question proposes a List<DefaultCellEditor>, when a much simpler renderer will do.

Here, a CellEditor can manage a List<DefaultComboBoxModel<Element>>, selecting the correct combo model for the row currently being edited and invoking setModel() on the editor component. As each new table row is added, the editor would add a new element to the List and adjust existing elements as required. I would expect the complexity to grow as O(n²), where n is the cardinality of the Set.