one side （ Base surface ： about 60 minute ）

1. Self introduction.
2. The judgment of the equality of objects ,equals Method realization .Hashcode The role of , And equal What's the difference? ？
3. Java in CAS Algorithm ？
4. G1 Let's talk about the recycler ？
5. HashMap,ConcurrentHashMap And LinkedHashMap The difference between
6. How to use in multithreading environment Map,ConcurrentHashMap principle ,ConcurrentHashMap How to lock .
7. Synchronous implementation of multithread concurrency , There are two ways , There's one in each method a Partial codes and b Part of the code , I want two threads to execute two methods separately , And let them run it a Part of the code goes down together , How to achieve .
8. TCP Three handshakes and four waves in the connection , The last of the four waves ack What is the role of , Why time wait, Why 2msl.
9. aio,nio,bio Understanding
10. ReetrantLock and synchronized The difference between .
11. Java What are the implementation of pessimistic lock ？
12. Java Which classes implement optimistic locking ？

Two sides （ On the other hand, I'll catch multithreading and ask ）

1. What are the parameters of thread pool ？ What's the use of each ？ If the number of tasks exceeds the number of core threads , What's going to happen ？ What is the size of the blocking queue ？
2. Database connection pool , The bottom implementation says
3. hashset Underlying implementation ,hashmap Of put The operation process
4. say something HaspMap Underlying principle ？ Besides, it's related to HaspTable and ConcurrentHashMap The similarities and differences between them ？
5. say something B+ Trees and B The difference between trees , Advantages and disadvantages ？
6. Algorithm problem , Merge and sort a linked list , The linked list may have rings
7. How to implement a thread safe counter ？
8. Atomic classes AtomicInteger What is the principle of implementation ？ Compare with the counter you designed ？CAS How to realize atomic operation ？
9. Java What's wrong with the lock in the ？synchronized And Lock The difference between ？ How to realize fair lock and unfair bottom layer ？AQS Introduce the principle in detail ？
10. How do you usually tune in a project JVM What about ？
11. The way GC Well , When to proceed Full GC Well ？
12. What collectors do you know about ？CMS and G1. Talk about it in detail G1 The advantages of

On three sides （Redis and mysql We should also master , Interview is also a must **）**

1. Know what sort algorithms , Talk about complexity
2. Hand tearing, merging and sorting
3. Redis What are the data structures ？ What are the underlying codes ？ What different codes are used for ordered lists ？
4. redis Of hash How many elements can a data structure store at most
5. How to realize RPC？
6. mysql Default storage engine ？MyISAM、InnoDB、MEMORY The difference between
7. What is unreal reading , How to solve
8. What is the transaction isolation level ？ By what ？ What problems have been solved respectively ？
9. Usage scenarios of optimistic lock and pessimistic lock

Four sides （ There are more technical questions here Distributed architecture ?dubbo spring cloudKafka database ）

1. Introduce the projects that will help you most in your technical ability , Focus on architecture design ideas
2. Distributed, globally unique ID How to achieve ？
3. dubbo How producers publish Services , Registration service , How consumers invoke services ？
4. dubbo What are the load balancing strategies ？ Let's talk about consistency hash in detail ？
5. Distributed session How to achieve it
6. Microservice your understanding ？ And common microservice solutions dubbo、spring cloud Comparison ？
7. Kafka How to ensure data reliability ？
8. How to solve the data consistency of master-slave synchronization in database ？ The advantages and disadvantages of technical solutions are compared ？
9. Do you know how to implement distributed locks ？ What are the mainstream solutions ？
10. Spring Two characteristics ？AOP and IOC
11. Spring The initialization process ？Spring bean Life cycle of ？
12. Multiple RPC Please come in , How does the server handle concurrency ？

HR Noodles （ See following ）

Routine problems

What kind of setbacks

This kind of question mainly inspects whether the interviewer can persist in meeting difficulties , And we can see his ability to solve problems .

It can simply describe setbacks , And explain how you can overcome , What are the final results .

Occupation planning

Show your determination to , First of all, I'm not going to continue my studies , It's time to get a job . Then say that I will not change industries in a short period of time , Or change jobs , I like , I hope I can stick to my interest for several years and plan again .

What do you know about Ali

This is a simpler answer , Just boast .

Are there any worshippers

I said James Harden ,hr My little sister laughed . I can say something about this IT Daniel .

Where do you want to work

This is the city where the company is located .

Other questions

What are your hobbies , Do you have anyone who can take it to the stage to perform Something deep in memory

summary

Although I often laugh at myself , I'm going to be a takeout specialist in ten years , But in fact, we rely on our own efforts , It can reduce the anxiety after 35 years old , After all, there are not many good architects .

Architects , It's the career goal of most of our technical people , A good architect comes from opportunities ( company )、 Personal effort ( Eat bitterly 、 Willing to study )、 talent ( I really love it ) The result of the cooperation of the three parties , practice + Opportunity + Hard work can help you become a good architect .

If you also want to be a good architect , Then maybe this Java Growth notes You need to read , Hope to be helpful to your career development .

This article has been  CODING Open source project ：【 A big factory Java Analysis of interview questions + Core summary learning notes + The latest explanation video + Actual project source code 】 Included