public class CarSimulation implements SimulationListener

    public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        @Override
        public void run() {
            try {
                CarSimulation window = new CarSimulation();
                window.CarSimulation.setVisible(true);
                Cars cargame = new Cars();

            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}