public static void main(String args[]) throws Exception {
        try {
            UIManager.setLookAndFeel("com.birosoft.liquid.LiquidLookAndFeel");
//            UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
            Principal principal = new Principal();
            principal.setExtendedState(JFrame.MAXIMIZED_BOTH);
            Toolkit theKit = principal.getToolkit(); // for Fullscreen  
            principal.setBounds(new Rectangle(theKit.getScreenSize()));  
            principal.setVisible(true);
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
        } catch (UnsupportedLookAndFeelException ex) {
            Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
        }
        
    }