[Java] Common Knowledge Pocket Reference

https://docs.google.com/document/d/1bJrzcsm7YjN_uD-qx9MOaHf6BHw8wnCZptxcwkF4pjU/edit

[LeetCode] Programming Bug Note

1. Delete Element In Unordered ArrayList, Vectors

    a. Say delete 3 from 1 3 5 7 9, we replace 3 with 9 and erase 9, resulting in 1 9 5 7 9

    b. But when deleting element 9, when we replace 9 with 9, then delete 9, (Seems works ok)

        But in the Leetcode problem Insert 380 381 Delete GetRandom O(1), when the index of the removed element, 1 in example 1, and 4 in example 2 is going to be used again in the future. Index 4 is actually out of bound in the second example.

        In this case, operation sequence matters, it is infact two different types of operation sequence, while the result coincidents in some cases.

[Test] Test Cases

关于TC的问题:

1. 分类 (classification)
   unit test -> functional test -> integration test -> scenario test
越往右边TC的数目应该越少一些

2. 设计TC，还是要分类
   1) positive TC - happy path
   2) negative TC - 0, NULL, exception, overflow/underflow,
   3) corner TC

3. 其他TC(基本就是靠嘴巴说)
   1) Performance
   2) Scalability
   3) Load
   4) Stress
   5) Code coverage
   6) Localization
   7) Internationalization
   8) Security