2017N-HL-Payment — IB CS HL P2 Option D

Payment

public class Payment {
    private FoodItem[] fi = new FoodItem[100];
    private int fiCount;
    private static double foodTax = 0.2;
    private DrinkItem[] di = new DrinkItem[100];
    private int diCount;
    private static double drinkTax = 0.1;

public Payment() {
        fiCount = 0;
        diCount = 0;
    }

public FoodItem getFi(int x) { return fi[x]; }
    public DrinkItem getDi(int x) { return di[x]; }
    public int getFiCount() { return fiCount; }
    public int getDiCount() { return diCount; }
    public static double getFoodTax() { return foodTax; }
    public static double getDrinkTax() { return drinkTax; }

public void addFoodItem(FoodItem item) {
        fi[fiCount] = item;
        fiCount++;
    }

public void addDrinkItem(DrinkItem item) {
        di[diCount] = item;
        diCount++;
    }

public static double findPrice(Item[] pl, String c) {
        for (int i = 0; i < pl.length; i++) {
            if (pl[i] != null && pl[i].getCode().equals(c)) {
                return pl[i].getPrice();
            }
        }
        return -1.0;
    }

public double calculateBill(Item[] pl) {
        double total = 0.0;
        for (int i = 0; i < fiCount; i++) {
            String code = fi[i].getItemCode();
            double unitPrice = findPrice(pl, code);
            total += unitPrice * fi[i].getQuantity() * (1 + foodTax);
        }
        for (int i = 0; i < diCount; i++) {
            String code = di[i].getItemCode();
            double unitPrice = findPrice(pl, code);
            total += unitPrice * di[i].getQuantity() * (1 + drinkTax);
        }
        return total;
    }
}

FoodItem

DrinkItem

Item

⚡ Java Execution Console — Main class

public class Main {
    public static void main(String[] args) {
        Payment[] tables = new Payment[50];

tables[1] = new Payment();
        tables[2] = new Payment();

FoodItem a = new FoodItem("f102", 2);
        FoodItem b = new FoodItem("f100", 1);
        DrinkItem c = new DrinkItem("d102", 3);

tables[1].addFoodItem(a);
        tables[1].addFoodItem(b);
        tables[2].addDrinkItem(c);
        tables[2].addDrinkItem(new DrinkItem("d103", 1));

System.out.println("Q16(a) Output:");
        System.out.println(tables[1].getFiCount());
        System.out.println(Payment.getFoodTax());
        System.out.println(tables[2].getDi(1).getItemCode());

Item[] pl = new Item[200];
        pl[0] = new Item("f1021", "Pizza",  12.50);
        pl[1] = new Item("f100", "Pasta",  10.00);
        pl[2] = new Item("d102", "Cola",    3.00);
        pl[3] = new Item("d103", "Water",   2.50);

System.out.println("\n--- CalculateBill Demo ---");
        System.out.println("Table 1 bill: $" + tables[1].calculateBill(pl));
        System.out.println("Table 2 bill: $" + tables[2].calculateBill(pl));
    }
}

▶ Click Run All to compile & execute.