polymorphism (다형성) Example

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());

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

class Product{
    int price; // product's price
    int bonusPoint; // membership point when you buy something

    Product(int price){
        this.price=price;
        this.bonusPoint=(int)(price/10.0);
    }
}

class Tv extends Product{
    Tv(){
        super(100);
    }
    public String toString(){
        return "TV";
    }
}

class Computer extends Product{
    Computer(){
        super(200);
    }
    public String toString(){
        return "Computer";
    }
}

class Buyer{
    int money=1000;
    int bonusPoint=0;

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

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