请教&讨论亚马逊OA2 worksimulation三个题

想和大家请教下亚马逊OA2 WORKSIMULATION的三个题。

15 Customer Complaints on Recommendation Service
Priya Senior SDE
We have been receiving a lot of customer complaints over the past three days about problems on pages related to your new Recommendation feature. It is likely being caused by one of the three services you’re using. There have been no recent updates to the services and we have ruled out all external factors. This issue is affecting customers, resulting in our product order rate dropping. We really need to solve this as quickly as possible. The reporting team generated an error report(see attached), let me know what you think.
Thanks,
Priya

Based on the data in the Error Rate over Time report, how would you respond? Please select only one response option.
Identify Service 1 as the problem
Identify Service 2 as the problem
Identify Service 3 as the problem
I think

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effective way of improving the ShoppingCart() class
for the long term? Please select only one response option. ?
A. ShoppingCart should not override the user property every time new product is added to it.
B. Make ShoppingCart a property of Product class to improve performance.
C. Change the design of ShoppingCart by removing ShoppingCart.user and making shopping cart a property of User instead.
D. Product should have getUser() method so that we know what user has added it to his/her shopping cart.

LZ你这样发帖不好吧，毕竟这是可以搜到的啊。

天上飞哒猪 发表于 2016-3-8 22:12
LZ你这样发帖不好吧，毕竟这是可以搜到的啊。

额，版主如果觉得不合适就删了吧

shopping cart那题我也想知道答案