code: private static void initLookAndFeel() {
  		// UIManager.setLookAndFeel("javax.swing.plaf.nimbus.NimbusLookAndFeel");
  		for (final LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
  			if ("Nimbus".equals(info.getName())) {
  				try {
  					UIManager.setLookAndFeel(info.getClassName());
  					break;
  				} catch (final Exception e) {
  					throw new RuntimeException(e); // NOPMD
  				}
  			}
  		}
  	}
docs: Initialisation du L&F.