code: private static void initLookAndFeelIntern(final String className) {
          try {
              UIManager.setLookAndFeel(className);
          } catch (final Exception e) {
              throw new RuntimeException("Error initializing the Look And Feel!", e);
          }
      }
docs: Initializes the look and feel and wraps exceptions into a runtime
  exception. It's executed in the calling thread.
  
  @param className
  Full qualified name of the look and feel class.