public class MyApplication {
     public static void main(String[] args) {

         // Only override the UI's necessary for ColorChooser and
         // FileChooser:
         Set includes = new HashSet();
         includes.add("ColorChooser");
         includes.add("FileChooser");
         includes.add("Component");
         includes.add("Browser");
         includes.add("Tree");
         includes.add("SplitPane");
         QuaquaManager.setIncludedUIs(includes);

         // set the Quaqua Look and Feel in the UIManager
         try { 
              UIManager.setLookAndFeel(
                  "ch.randelshofer.quaqua.QuaquaLookAndFeel"
              );


         // set UI manager properties here that affect Quaqua
         ...
         } catch (Exception e) {
             // take an appropriate action here
             ...
         }
         // insert your application initialization code here
         ...
     }
}