Stream filter and sort example

Scratch.java

/*
In this scenario we create twenty random cars (random model and year).
An expected result is to only get Toyota and sort by year, newest first.
*/

class Scratch {

    public static void main(String[] args) {
        List<Car> cars = CarFactory.createTwentyRandomCars();
        System.out.println("Initial Cars list: " + cars.toString());

        List<Car> sortedCard = cars.stream() // Convert to a stream
            .filter(car -> car.getModel() == Model.TOYOTA) //Take only toyota
            .sorted(Comparator.comparing(Car::getYear).reversed()) //Sort by year DESC
            .collect(Collectors.toList()); //Convert back to list

        System.out.println("Sorted Cars list: " + sortedCard.toString());
    }

    static class CarFactory {
        public static Car createCar() {
            return new Car(generateRandomModel(), generateRandomYear());
        }

        protected static Model generateRandomModel() {
            return Model.values()[ThreadLocalRandom.current().nextInt(0, Model.values().length)];
        }

        //between 2000 and 2021
        protected static Year generateRandomYear() {
            return Year.parse(String.valueOf(ThreadLocalRandom.current().nextInt(2000, 2022)));
        }

        public static List<Car> createTwentyRandomCars() {
            return Stream.generate(CarFactory::createCar).limit(20).collect(Collectors.toList());
        }
    }

    static class Car {

        public Car(final Model model, final Year year) {
            this.model = model;
            this.year = year;
        }

        private final Model model;
        private final Year year;

        public Model getModel() {
            return this.model;
        }

        public Year getYear() {
            return this.year;
        }

        @Override
        public String toString() {
            return "Car{" +
                "model=" + model +
                ", year=" + year +
                '}';
        }
    }

    enum Model {
        TOYOTA,
        FORD,
        HONDA,
        MAZDA,
        DODGE
    }
}