<p>I need to setup LookAndFeel Files in JDK 1.6.
I have two files:</p>

<ol>
<li><p>napkinlaf-swingset2.jar</p></li>
<li><p>napkinlaf.jar</p></li>
</ol>

<p>How can I set this up and use it?</p>

<p>I would like a GTK look and feel OR Qt look and feel, Are they available?</p>

This page explains how the work with Look&Feels:
http://java.sun.com/docs/books/tutorial/uiswing/lookandfeel/plaf.html
You can do it commandline:
```
```
java -Dswing.defaultlaf=com.sun.java.swing.plaf.gtk.GTKLookAndFeel MyApp
```
```
Or in code:
```
```
UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
```
```
You need to make sure the jars containing the look&feel are on the application classpath. How this works depends on the application. A typical way would be to put it in a lib folder.
Look&Feels that are available by default in the JDK are:
```
```
com.sun.java.swing.plaf.gtk.GTKLookAndFeel
com.sun.java.swing.plaf.motif.MotifLookAndFeel
com.sun.java.swing.plaf.windows.WindowsLookAndFeel
```
```
Quioting the link above:
The GTK+ L&F will only run on UNIX or
  Linux systems with GTK+ 2.2 or later
  installed, while the Windows L&F runs
  only on Windows systems. Like the Java
  (Metal) L&F, the Motif L&F will run on
  any platform.