Interview summary

1.String Class

2.StringBuffer and StringBuilder The difference between

3.Linux System commands to view memory conditions

4.Linux The system commands to view logs

5.Linux Process of system deployment project

6.Jvm Principle

7. What frameworks are exposed to

8.Spring Where is the startup item of the framework written , How to configure

9.Spring Common notes

10.Sql Optimize

11. The nature of transactions

12. What are the types of indexes ？ Tell me about your understanding of them

13. Advantages and disadvantages of index

14.Vavchar and Char The difference between

15. Common types of exceptions

16.Error and Exception The difference between

17.HashMap The underlying implementation principle of

18. Tell me about the locking mechanism you know

19. Talk about your project

20. How many people in the project team , How long is the project cycle

21.Try-catch-finally What each code block contains ？ What is their order of execution ？

22.HashMap When we expand the capacity of the network, it must be 2 Power of power ？

23.== and equals The difference between ？

24. The difference between sets and arrays ？

--------------------------------------- answer ------------------------------------------------------------------------------------

1.

2.

3.

4.

5.

6.

7.

8.

9.Spring Annotations used in the framework

@Bean

@Configuration

@AutoWired

@RestControllerAdvice

@ExceptionHandler

24. The difference between sets and arrays

The length of the array is fixed , The length of the set is variable

An array stores elements of the same type , Basic data type values can be stored , You can also store objects .

Collections store objects , And the types of objects can be different .