Alibaba wins offer rating P7, the latest and most comprehensive Alibaba 68 advanced interview questions in 2020

Preface

When I recently got together and chatted with a few friends on May Day, I found out that the new wave of recruitment peak season may be about to begin. The new beginning of 2021 is not very good. The recruitment is still under great pressure. As a developer, have you met your ideal company and the salary has reached the ideal height in your mind?

Interview: If you don't prepare for an adequate interview, it will be a waste of time and you will be irresponsible for yourself.

Today I will share with you the Java architecture interview topics and answers I have compiled (see the interview answers at the end of the article) . Most of them are frequently asked interview questions for large companies. You can check this to fill in the vacancies. Of course, the ones listed here are definitely It is impossible to cover all the methods, but I also hope to help friends who are about to find a job!

Alibaba P6 technology four sides (intermediate)

Alibaba's latest 2021 interview answers are available for free at the end of the article

One side (asked about data structure, jvm, lock, etc.):

  1. Self-introduction and projects
  2. How to realize the bottom layer of HashMap?
  3. Hash consensus algorithm?
  4. Talk about the difference between HashMap and ConcurrentHashMap? What is the difference between treemap and HashMap?
  5. java memory partition?
  6. How to recycle java objects, recycle algorithm?
  7. Do CMS and G1 understand?
  8. What problem does CMS solve? Tell me about the recycling process?
  9. How many times did the CMS recovery pause?
  10. When will the java stack overflow? What about the java heap, a scenario?
  11. How does the collection class solve this problem (soft reference and weak reference), and what is the difference between these two references?
  12. What do you know about locks in java?
  13. The process of synchronized lock upgrade (bias lock to lightweight lock and then to heavyweight lock), how are they realized, and what problems are they solved?
  14. What is the basic architecture of Tomcat?
  15. What is a class loader?
  16. Talk about the parent delegation model mechanism?
  17. What is the mechanism of GC? GC algorithm and recovery strategy?
  18. Future career plan?

Two sides (thread, database, cache, protocol, etc.):

  1. Talk about the project
  2. What are the components of the thread pool?
  3. What thread pools are there and how to use them? What are the rejection strategies?
  4. When will deadlock occur in multithreading, write an example?
  5. What is the data structure of Redis? What about the threading model?
  6. Talk about Redis's data elimination mechanism?
  7. Talk about the data consistency problem of Redis?
  8. How to do Redis distributed?
  9. What about RPC?
  10. Three handshake and four waves? Is there a problem if there is no three-way handshake?
  11. Http request process, DNS resolution process?
  12. What are the names of the four transaction isolation levels supported by InnoDB? What's the difference? Talk about the MySQL isolation level?
  13. The characteristics of the transaction and slow query?
  14. What about the BTree mechanism?
  15. Talk about the optimization methods commonly used in MySQL?

Three sides (distributed, message queue, etc.):

  1. Self introduction
  2. Do you understand cap and what do they mean?
  3. What are the ways to achieve strong consistency and weak consistency?
  4. How to achieve load balancing? Why do you do this?
  5. What about the cache avalanche?
  6. How does MySQL master-slave replication work? What is the specific principle? What are the advantages and disadvantages?
  7. Talk about distributed transactions?
  8. Message queue, what scenarios are used (peak clipping, current limiting, asynchronous)?
  9. How to overcome the performance bottleneck of zk?
  10. Speaking of Kafka, how to ensure that data is not lost? Ensure that the message will not be consumed repeatedly?
  11. How does the message delivery confirmation work?

Four sides (starting from the project):

  1. Talked about my project
  2. What are the main architectures used?
  3. Tell me about the more complex business logic?
  4. Encountered difficult problems and breakthrough gains
  5. Future plans and future career development, talk about your own views

Ali senior post interview questions

Alibaba's latest 2021 interview answers are available for free at the end of the article

Alibaba wins offer rating P7, the latest and most comprehensive Alibaba 68 advanced interview questions in 2020
Alibaba wins offer rating P7, the latest and most comprehensive Alibaba 68 advanced interview questions in 2020

Meituan Interview Questions

1. Is self-increment (i++) thread-safe in Java? How to achieve thread-safe self-increment?

2. Other commonly used thread-safe classes;

concurrentHashMap;

3. How does ConcurrentHashMap achieve thread safety?

4. Is Synchronized a fair lock;

5. ThreadLocal usage and principle?

6. Has the stream in Jdk8 been used? The parallel operation principle of stream? Where did the stream parallel thread pool come from?

7. Is the completableFuture in Jdk1.8 useful?

8. What is the difference between Spring AOP and native aspect AOP;

9. How many ways are there to implement Java agent?

10. Why does Jvm increase the matespace (matespace);

11. How to check the problem in JVM and perform JVM tuning?

12. Do you know the G1 garbage collector and what are its characteristics?

13. Server hardware configuration?

14. In what scenarios to upgrade the configuration, and in what scenarios to expand the cluster?

15. Why use RPC framework? When will http requests be used?

16. Under what scenarios will mq be used? The advantages and disadvantages of mq? When can't use mq? (Can't synchronize)

17. Why not add indexes to all mysql tables?

18. Why use B+ tree instead of hash for Mysql index? What is the time complexity of the underlying hash?

19. B+ tree index can perform range query, such as greater than less than;

20. How to update the cached data synchronously with db? ? ? ! ! ! (Dachang will ask!)

21. Linked list: 1->2->3->4->5; please write a program to reverse the linked list: 5->4->3->2->1

Alibaba's latest 2021 interview answers are available for free at the end of the article

Organize a complete set of interview videos explained for interviews: Spring Complete Works + Tank Battle + Design Patterns + Microservices + High Concurrency Multithreading + JVM + Redis, etc.

Engineers and friends who are interested in the complete video of Ma Soldier help forward this action , add VX: "MXM9809" to receive it

Alibaba wins offer rating P7, the latest and most comprehensive Alibaba 68 advanced interview questions in 2020
Alibaba wins offer rating P7, the latest and most comprehensive Alibaba 68 advanced interview questions in 2020
Alibaba wins offer rating P7, the latest and most comprehensive Alibaba 68 advanced interview questions in 2020

Arrangement and sharing of Ali's latest interview answers

It’s not easy for the editor to sort it out. If you are interested in this latest Alibaba interview question and answer, please help forward it and add VX: "MXM9809" to receive it.

Alibaba wins offer rating P7, the latest and most comprehensive Alibaba 68 advanced interview questions in 2020
Alibaba wins offer rating P7, the latest and most comprehensive Alibaba 68 advanced interview questions in 2020
Alibaba wins offer rating P7, the latest and most comprehensive Alibaba 68 advanced interview questions in 2020
Alibaba wins offer rating P7, the latest and most comprehensive Alibaba 68 advanced interview questions in 2020

It’s not easy for the editor to sort it out. If you are interested in this latest Alibaba interview question and answer, please help forward it and add VX: "MXM9809" to receive it.