1, java collection of classes listed?
2, the underlying structure of the set of java classes?
3, multi-threaded programming, state of the thread?
4, synchronized keyword, combined with specific code analysis?
5, the difference between sleep and wait method method?
6, notifyall and notify the difference?
7, springboot advantages?
8, the underlying dependency injection is how to achieve?
9, autowired role?
10, git operation?