다형성 예제 2 (객체 배열 추가)

package javafuture;


import javafx.scene.Parent;

public class Example {
    public static void main(String[] args) {
        Buyer b = new Buyer();
        b.buy(new TV());
        b.buy(new Computer());
        b.buy(new Audio());

        System.out.println(b.bonusPoint);
        System.out.println(b.money);

        b.summary();
    }
}

class Product {
    int price;
    int bonusPoint;

    Product(int price) {
        this.price = price;
        bonusPoint = (int) (price / 10);
    }

    Product() {
    }
}

class TV extends Product {
    TV() {
        super(100);
    }

    @Override
    public String toString() {
        return "TV";
    }
}

class Computer extends Product {
    Computer() {
        super(200);
    }

    @Override
    public String toString() {
        return "Computer";
    }
}

class Audio extends Product {
    Audio() {
        super(50);
    }

    @Override
    public String toString() {
        return "Audio";
    }
}

class Buyer {
    int money = 1000;
    int bonusPoint = 0;
    Product[] item = new Product[10];
    int i = 0;

    void buy(Product p) {
        if (this.money < p.price) {
            System.out.println("No Money");
            return;
        }

        this.money -= p.price;
        this.bonusPoint += bonusPoint;
        item[i++] = p;
        System.out.println("You bought " + p);
    }

    void summary() {
        int sum = 0;
        String itemList = "";

        for (int i = 0; i < item.length; i++) {
            if (item[i] == null)
                break;
            sum += item[i].price;
            itemList += item[i] + ", ";
        }

        System.out.println("sum : "+sum);
        System.out.println("products : "+itemList);
    }
}