public static void main( String[] args )
    {
        try
        {
            UIManager.setLookAndFeel( UIManager.getCrossPlatformLookAndFeelClassName( ) );
        }
        catch( Exception e )
        {
            e.printStackTrace( );
        }
        InterfazAlquilerCarros interfaz = new InterfazAlquilerCarros( );
        interfaz.setVisible( true );
    }