A Collection of an Abstract Class (or something like that…)

Question

The Scenario

I\'m making a program in Java that involves cars.

NOTE: I\'ve simplified this scenario (to the best of my ability) to make

Answer 1

I used the method described in Daryl Teo's answer, but I modified it a little bit to include an enum (since there are a finite number of individual cars). Because his answer was so instrumental to the development of my final solution, I selected it as the best answer.

The CarCreationStrategy interface:

public interface CarCreationStrategy {
    public void buildCar(Car car);
}

enum CarTypes implements CarCreationStrategy{
    CORVETTE() {
        @Override
        public String toString() {
            return "Corvette";
        }

        public void buildCar(Car car) {
            car.setSpeed (0.9);
        }
    },
    CLUNKER() {
        @Override
        public String toString() {
            return "A piece of junk!";
        }

        public void buildCar(Car car) {
            car.setSpeed (0.1);
        }
    }
}

The Cars class:

public class Cars {
    private List cars = new List;

    public void createCar() {
        // There would be logic here to determine what kind
        // We'll make a Corvette just to demonstrate
        Car car = new Car(1998, CarTypes.CORVETTE);
        cars.add(car);
    }
}

The Car class:

public class Car {
    private int year;
    private double speed;

    public Car(int year, CarType type) {
        this.year = year;
        type.buildCar(this);  // Sets the speed based on CarType
    }

    public void setSpeed(double speed) {
        this.speed = speed;
    }
}