ToString.java

class ToString {
    public static void main(String[] args) {
        Car car = new SportCar();
        System.out.println(car);
    }
}

class Car {
    protected int speedMax = 100;

    public int getSpeedMax() {
        return speedMax;
    }
}

class SportCar extends Car {
    protected int speedMax = 300;

    public int getSpeedMax() {
        return speedMax;
    }
}