다형성 예제3 (Vector 추가)

package javafuture;

import javafx.scene.Parent;
import java.util.*;

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

        b.buy(tv);
        b.buy(com);
        b.buy(audio);

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

        b.summary();
        System.out.println();

        b.refund(com);
        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;
    Vector item=new Vector();
    int i = 0;

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

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

    void refund(Product p){
        if(item.remove(p)){
            this.money+=p.price;
            this.bonusPoint-=p.bonusPoint;
            System.out.println("You refunded "+p);
        }else
            System.out.println("You didn't bought anything");
    }

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

        if(item.isEmpty()){
            System.out.println("No Products");
            return;
        }

        for(int i=0;i<item.size();i++){
            Product p=(Product)item.get(i);
            sum+=p.price;
            itemList+=(i==0)? ""+p:", "+p;
        }

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