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This article mainly explains "what are the interview questions often asked by JAVA". Interested friends might as well take a look. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn "what are the interview questions often asked by JAVA?"

1. How to realize distributed transaction and how does your company solve it?

2. HashMap data structure and implementation principle, what problem is the linked list used to solve?

3. Can you customize the java.lang.String class and explain why

4 、 redis

1) what are the types of data structures

2) how to prevent cache penetration

3) how to build a cluster and what are the solutions

4) what's the difference between memcache and ehcache

5) how to make persistence

5. How to prevent deadlock

6 、 zookeeper

1) talk about the election algorithm

2) what are the types of nodes?

3) what are the application scenarios

4) how to deploy the cluster, at least how many machines are there?

7 、 dubbo

1) what communication framework is used in it

2) what's the difference between and dubbox

3) what serialization framework is used in it

4) how to use zookeeper to realize registration discovery? is there any other way to achieve registration discovery?

5) do you know anything about other distributed frameworks

6) how to solve the problem of long chain of distributed service invocation

7) is it blocked?

8) tell me about the core configuration

8. What are the ways of thread synchronization

9. Talk about the structure of your company and draw it

10. Springmvc loading process

11. What are the load balancing algorithms for nginx

12 、 mysql

1) how to optimize sql? How to perform performance testing

2) what are the types of indexes and their application scenarios

3) how is the active and standby synchronization carried out and what is the principle?

4) what are the methods of sub-database and sub-table, how to solve the problem of uneven data distribution, and how to avoid querying a certain field to scan the whole table of the database?

5) what are the transaction isolation levels and which is the default?

6) how to solve the problem of phantom reading

7) read-write separation scheme

8) what are the engines and application scenarios

13. What's the difference between # and $of the mybatis placeholder

14. How to realize the distributed lock, the problems to be considered

15. What are the spring transaction propagation mechanisms and how to implement require_new with jdbc

16. Java collection common classes and data structures

17 、 MQ

1) what is push mode and what is pull mode

2) is there any loss of information and how to prevent it

3) what problems are solved by MQ

4) what MQ do you use, why do you use this, and what is its maximum throughput

18. Design pattern

1) talk about the six design principles

2) what design patterns do you know

3) what is the difference between decoration mode and agent mode

4) what are the ways of writing the singleton model and what are the points for attention?

5) how to implement the policy pattern

6) what design patterns are used in spring

19. What are the states in which the thread flows

What is spring ioc aop, what are the ways to implement dynamic proxy, and what is the relationship between the proxy class and the original class

21. What are pessimistic locks and optimistic locks, and how to achieve them respectively

22. What kinds of thread pools are included in java? tell me about their application scenarios.

23. Talk about volatile keywords and usage scenarios

24. How to troubleshoot multithreading problems

25. What are the solutions for session sharing

26. What are the commands of jvm and how to use them?

27. Talk about jvm memory mode and how to tune it

28. How to tune tomcat

29. What are the means to ensure the security of user login

How to reduce inventory and how to prevent overbuying and overselling

31. Why is the TCP protocol three handshakes and four waves? why is it nothing else?

32. What are the parts of the HTTP message

33. How to do interface security

34. What would you pay attention to if you were asked to implement the RCP framework

35. Linux commands for viewing cpu, memory, hard disk, network IO, load, port occupancy, and a specific process

36. Hash algorithm of statement consistency

37. Talk about class loading mechanisms and how they are designed

38. How do you plan your career? what are your plans for the next three years

39. What offer do you have on hand? will you consider our company? what do you want to know about our company

Why do you want to leave (be careful about this, don't complain about your former company, let alone speak ill, or you can't pass no matter how skilled you are)

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