public class Exercise7_19 { public static void main(String[] args) { Buyer b = new Buyer(); b.buy(new TV()); b.buy(new Computer()); b.buy(new TV()); b.buy(new Audio()); b.buy(new Computer()); b.buy(new Computer()); b.buy(new Computer()); b.summary(); }} class Buyer { int money = 1000; Product[] cart = new Product[3]; int i = 0; void buy(Product p) { if (money < p.price) { System.out.println("잔액이..