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package codemiles;
public class Car {
   protected int CarSpeed;
   protected String CarModel;
   private int ID=0;

    public void setCarModel(String CarModel) {
        this.CarModel = CarModel;
    }

    public void setCarSpeed(int CarSpeed) {
        this.CarSpeed = CarSpeed;
    }

    public String getCarModel() {
        return CarModel;
    }

    public int getCarSpeed() {
        return CarSpeed;
    }
    // Main Function
    public static void main(String[] args) {
   
    }
   
}
class RaceCar extends Car
{
    public void RunTurbo()
    {
        CarSpeed+=100;
    }
   
}
Any instance of of RaceCar can use the members of Car class except the variable (int ID) because it is private.