All around Ali Java Gang, his head is bald, and finally won the Offer!

Preface

"Golden Nine and Silver Ten" is coming to an end. I saw that many friends are anxiously preparing for job interviews, so today I will share with you the process of a friend from all sides of the Ali Java post. Helped.

one side:

1. Start by introducing yourself

2. The realization principle of HashMap, what is hash collision, and how to solve hash collision?

3. The principle of ConcurrentHashMap and the difference with HashTable?

4. The difference between HashSet and TreeSet and the underlying implementation principle

5. The key-value is stored in the HashMap, and the value is repeated but all of the Comparable type is comparable; how to sort this collection according to the value, and introduce the implementation method

6. What is the difference between ReentrantLock and synchronized keywords?

7. Synchronized modifies the static method, what is the specific lock?

8. Troubleshooting methods for cpu and memory abnormalities during work; explain the analysis process and positioning solutions in detail

9. Next is the project:

The problem in the project is relatively simple
10, and then there are various basics, jvm memory model, nio, bio, aio, high concurrency, sychronized and volltail, HashMap, data structure and expansion

11. There are still some scene problems, how to design the system in the case of large concurrency/mass quantity. Take two points from it to ask, one is system decoupling, the other is sub-database and sub-table

12. The last one is the coding question. The key in HashMap is a custom object. There are many questions about sorting jvm. How to distribute the online version, redis command, data structure, internal database lock mechanism, online problem Solve, sql optimization, etc.

Two sides:

1. The principle of ClassLoader, cite application scenarios and working examples, introduce the class loading process and application in work
2. The realization principle of HashMap, what is hash collision, and how to solve hash collision?
3. The principle of ConcurrentHashMap and the difference with HashTable?
4. The difference between HashSet and TreeSet and the underlying implementation principle
5. The key-value is stored in the HashMap, and the value is repeated but all of the Comparable type can be compared; how to sort this set according to value, and introduce the implementation method
6. What is the ReentrantLock and synchronized keywords the difference?
7. Synchronized modifies the static method, what is the specific lock?
8. Troubleshooting methods for cpu and memory exceptions at work; explain in detail the analysis process and positioning solutions
9. The principle and optimization of a jvm
10. The optimization of sql
11. The principle of the framework used now, such as using dubbo, will ask about the principle of dubbo , And how h5 calls dubbo, etc.
12, then talks about the project, the problem in the project is relatively simple
13, and then there are various basics, jvm memory model, nio, bio, aio, high concurrency sychronized and volltail, HashMap, data structure and Expansion> 14. There are still some scene problems, how to design the system in the case of large concurrency/massive number. Take two points from it to ask, one is system decoupling, the other is sub-database and sub-table

15. The last one is a coding question. If the key in the HashMap is a custom object, sort

Three sides

1. The method of implementing executor service, the parameters that can be set 2. An algorithm is proposed to find the nth node from the
bottom in the linked list 3. The difference between thread and runable is also asked 4. What is the clustered index
5. Redis A solution to a practical problem. If the value of redis is particularly large, what solutions are there? 6, redis memory elimination mechanism
7, mysql default isolation level 8, heap sorting
9, paxos protocol
10, cross-computer room deployment, encountered Problems and solutions, the annual rate of 9999 is
11, the DB architecture of MMM, the master is never fully synchronized, the master is down, what will be the impact of unsynchronized content, how to restore
12, what is the difference between ng and tomcat? Can the two roles be interchanged? That is: tomcat as a reverse proxy, ng as a service container. Explain the reason
13, DNS protocol
14, volatile realization principle
15, NAT: public network ip and LAN ip conversion
16. Class loading delegation mechanism, lock application, project structure

Four sides:

1. Jit, nio, sorting algorithm, hashmap, more details
about the project ~ 2. Talk about what the project is mainly responsible for, what is the architecture of the project, what is it responsible for, etc.;
3. JVM class loading mechanism
4. JVM memory model, what to put in the stack space, under what circumstances will the stack memory overflow, etc.
5. JVM tuning 5. JVM garbage collection mechanism
6. Is more concerned about financial knowledge, whether you have experience in financial project development
7. JVM fence problem, the use of threadlocal
8. JVM
9, multithreading
10, List intersection
11. Solve the problem of high CPU usage when the project is running
12. Thread synchronization mechanisms
13, Linux search log, match a certain Most requested top10

to sum up

This little partner succeeded in the final interview. Of course, success is not so simple. This little partner has done sufficient preparation work, like brushing questions, looking at some core knowledge points of Java, watching some interview blogs, and drawing everyone For some of the interview experience, I settled down and studied for 2 months before getting the offer.
If you want to pass the interview smoothly, everyone must learn!
The editor has sorted out most of the interview questions and answers involved in the interviews of some major java programmers to share with you for free, hoping to help everyone, friends in need can see the free way to get them below !

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Finally, thank you for your support, and hope that the information compiled by the editor can help you! I also wish everyone a promotion and salary increase!