Question

I have a swing app. with a jframe with lots of internal frames containing large JTable.
Those jtables get updated continuously so there is lots of repainting going on.

in some circumstances I can simply keep the JFrame invisible. (frame.setVisible(false))

I was wondering if anybody knows if I will gain something in terms of performance
(something considerable or not)

such as 50% gain or you would only get 2% gain…

and maybe some sort of explaination on what to expect.

thanks

p.s.
Another way to rephrase the question is:
Are swing components clever enough not to repaint/reflow theirselves if not visible ???

Answer 1

If your JTable is in a JScrollPane it seems it will repaint at each line adition (and call to fireTableRowsInserted of your model). Thus because the scrollpane will update it scollbars and then its contained component (JTable). If your table is not in a scrollpane then it will redraw only the shown lines. Therefore if your lines are not shown you will not trigger a repaint… Stupide. I’m looking for a way to avoid this.