public static void main(String[] args) { Transport car = new Car(700); Delivery del = new Delivery(); car.calculate(del); Transport plane = new Plane(500); Transport train = new Train(300); Transport plane1 = new Plane(100); plane.calculate(del); plane1.calculate(del); plane.calculate(del); System.out.println(plane.price); System.out.println(plane1.price); }