Test 1 OOP 2018

Test.java

class Test {
    public static void main(String[] args) {
        Buyer b1 = new Buyer("Miun", "Pasirlayung, Bandung");
        Purchase p = new Purchase(b1);

        Car t = new Truck("Hino Dutro", 120000.0, 5000.0);
        p.addCar(t);

        Car s = new SuperCar("Bugati", 800000.0, 300.0);
        p.addCar(s);

        p.printPurchase();
    }
}

class Car {
    protected String name;
    protected Double price;

    public Car(String name , Double price) {
        this.name = name;
        this.price = price;
    }

    public String getName() {return name;}
    public Double getPrice() {return price;}
    
    public void setName(String name) {
        this.name = name ;
    }
    public void setPrice(Double price) {
        this.price = price;
    }
}

class SuperCar extends Car {
    private Double topSpeed;

    public SuperCar(String name, Double price, Double topSpeed) {
        super(name, price);
        this.topSpeed = topSpeed;
    }

    public Double getTopSpeed() {return topSpeed;}
    public void setTopSpeed(Double topSpeed) {this.topSpeed = topSpeed;}
} 

class Truck extends Car {
    private Double maxCapacity;

    public Truck(String name, Double price, Double maxCapacity) {
        // assign constructor parent class, (Car)
        super(name, price);
        this.maxCapacity = maxCapacity;
    }

    public Double getMaxCapacity() {return this.maxCapacity;}
    public void setMaxCapacity(Double maxCapacity) {this.maxCapacity = maxCapacity;}
}

interface IPurchase {
    void printPurchase();
    int getTotalPurchase();
    void addCar(Car car);
}

class Purchase implements IPurchase {
    private Buyer buyer;
    private Car[] cars;
    private int totalPurchase;

    public Purchase(Buyer buyer) {
        this.buyer = buyer;
        totalPurchase = 0;
        cars = new Car[5];
    }

    @Override
    public void addCar(Car car) {
        cars[totalPurchase] = car;
        totalPurchase++;
    }

    @Override
    public void printPurchase() {
        System.out.printf("Mr./Mrs. %s \n%s \n---\n", buyer.getName(), buyer.getAddress());

        for(int i = 0; i < totalPurchase; i++) {
            // Polymrphism 
            if(cars[i] instanceof Truck) {
                System.out.printf("%d. %s \nPrice: \t$%.2f  \nMax capacity: \t%.2f CC \n\n", 
                i+1, cars[i].getName(), cars[i].getPrice(), ((Truck)cars[i]).getMaxCapacity());
            } else {
                System.out.printf("%d. %s \nPrice: \t$%.2f  \nTop speed: \t%.2f Mph \n\n", 
                i+1, cars[i].getName(), cars[i].getPrice(), ((SuperCar)cars[i]).getTopSpeed());
            }
        }
    }

    @Override
    public int getTotalPurchase() {
        return totalPurchase;
    }
}

class Buyer {
    private String name;
    private String address;

    public Buyer(String name, String address) {
        this.name = name;
        this.address = address;
    }

    public String getName() {return this.name;}
    public String getAddress() {return this.address;}

    public void setName(String name) {this.name = name;}
    public void setAddress(String address) {this.address = address;}
}