public class Car {

    private String name;

    private CarColors color;

    public enum CarColors {
        BLUE,
        GREEN
    }

    public Car(CarColors c) {
        color=c;
    }

    public CarColors getColor() {
        return color;
    }
}

public class RacingCar extends Car {

    private CarColors color;

    public RacingCar(CarColors c) {
        color=c;
    }

    public enum CarColors {
        BLUE,
        GREEN,
        RED
    }

    @Override //?????
    public CarColors getColor() {
        return color;
    }
}

Car racingCar = new RacingCar();
CarColors color = racingCar.getColor();

interface IColor{

}
enum CarColors implements IColor{
    BLUE,
    GREEN;
}
enum RacingCarColors implements IColor{
    BLUE,
    GREEN,
    YELLOW;
}
class Car {
    protected IColor color;
    public Car(IColor color){
        this.color = color;
    }
    public IColor getColor(){
        return color;
    }
}
class RacingCar extends Car{
    public RacingCar(IColor color){
        super(color);
    }
    public IColor getColor(){
        return color;
    }
}



public class Test{
    public static void main(String[] args) {
        Car car = new RacingCar(RacingCarColors.YELLOW);
        System.out.println(car.getColor());

    }
}

interface Color{

}
enum CarColor implements Color{
    BLUE,
    GREEN;
}
enum RacingCarColor implements Color{
    BLUE,
    GREEN,
    YELLOW;
}
class Vehicle<T extends Color> {
    protected T color;
    protected Vehicle(T color){
        this.color = color;
    }
    public T getColor(){
        return color;
    }
}

class Car extends Vehicle<CarColor>{
    public Car(CarColor color){
        super(color);
    }
}

class RacingCar extends Vehicle<RacingCarColor>{
    public RacingCar(RacingCarColor color){
        super(color);
    }
}