c.addGoodsInCart(i3, 3); 覆盖了c.addGoodsInCart(i1, 1);
// 先创建两个商品对象
Items i1 = new Items(1, "沃特篮球鞋", "温州", 200, 500, "001.jpg");
Items i2 = new Items(2, "李宁运动鞋", "广州", 300, 500, "002.jpg");
Items i3 = new Items(1, "沃特篮球鞋", "温州", 200, 500, "001.jpg");
Cart c = new Cart();
c.addGoodsInCart(i1, 1);
c.addGoodsInCart(i2, 2);
// 再次购买沃特篮球鞋，购买3双
c.addGoodsInCart(i3, 3);
Set<Map.Entry<Items, Integer>> items = c.getGoods().entrySet();
for (Map.Entry<Items, Integer> obj : items) {
System.out.println(obj);
}
System.out.println("购物车的总金额：" + c.getTotalPrice());
运行结果：
商品编号：1,商品名称：沃特篮球鞋=3
商品编号：2,商品名称：李宁运动鞋=2
购物车的总金额：1200.0
