How can I create cells in a JTable that span multiple rows/columns,
as you can do in HTML with the rowspan/colspan tags?
To the best of my knowledge, it is not possible to do this with
JTable. At least there's no easy way of doing it, but it may be possible with some serious acrobatics.
One possible starting
point may be to fake the effect by creating a custom CellRenderer that
paints a cell over some of its adjacent cells. The difficulty in
customizing JTable to do what you're asking is that JTable doesn't store
individual component cells, but instead aggregates them into a set of
TableColumnModels that take care of drawing the cells.
You may wish
to make use of GridBagLayout and represent each cell as an AWT
component if you have a relatively small amount of data to display. GridBagLayout will allow you to place components so that they
consume varying amounts of rows or columns in a grid.