CarService.java

package com.moondeuk;

import javax.ejb.Stateless;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

@Stateless
public class CarService {

    public List<Car> cars = new ArrayList<>();

    public List<Car> getCars() {
        return cars;
    }

    public void createCar(Car car) {
        cars.add(car);
    }
}