reference:
https://www.nowcoder.com/discuss/215891?type=2&order=0&pos=10&page=1
1. What will be the framework will not.
2. achieve lock. Pessimistic locking, optimistic locking.
3.sychronized and reentrantlock implementation principle
4.volatile principle
5.java design patterns, jdk which is used in design mode.
6.NIO talk about.
7. The difference between the two kinds of engine database.
8. hot backup.
9, four waved more detailed the better
10. If the connection has not wait what will happen.
11.concurrenthashmap implementation principle.
12. Binary switch list.
Interview and answer a lot of experience in books and learning materials please pay attention to micro-channel public number: AVAJ
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