This week's book giveaway is in the OCAJP forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide 1Z0-808 and have Jeanne Boyarsky & Scott Selikoff on-line! See this thread for details.
In my experience if you do not apply look-and-feel separately to JFileChooser, you see initial LF. So i think you can apply a different LF to your JFileChooser. An example code is in the url below if you need (you need to call SwingUtilities.updateComponentTreeUI(..) only on JFileChooser):