c.addGoodsInCart(i3, 3); 覆蓋了c.addGoodsInCart(i1, 1);
// 先創建兩個商品對象
Items i1 = new Items(1, "沃特籃球鞋", "溫州", 200, 500, "001.jpg");
Items i2 = new Items(2, "李寧運動鞋", "廣州", 300, 500, "002.jpg");
Items i3 = new Items(1, "沃特籃球鞋", "溫州", 200, 500, "001.jpg");
Cart c = new Cart();
c.addGoodsInCart(i1, 1);
c.addGoodsInCart(i2, 2);
// 再次購買沃特籃球鞋，購買3雙
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("購物車的總金額：" + c.getTotalPrice());
運行結果：
商品編號：1,商品名稱：沃特籃球鞋=3
商品編號：2,商品名稱：李寧運動鞋=2
購物車的總金額：1200.0
2019-07-27
public boolean addGoods(items item,int number) {
if(goods.containsKey(item)) {
goods.put(item,goods.get(item)+number);
}else {
goods.put(item, number);
}