4th Alibaba Yu’ebao Java Advanced Technology Post (take an offer): See what Ali asks?

Yu'ebao side (technical side)

Which areas are the JVM memory divided into, and what is the role of each area? What recovery algorithms does the JVM have, and what are the corresponding collectors?

Two judgment methods for GC? Features of CMS collector and G1 collector.

Hashmap source code problem

How to ensure thread safety of HashMap and HashMap, ConcurrentHashMap

Let's talk about the put operation of the underlying structure of HashMap

Two judgment methods for GC? Features of CMS collector and G1 collector.

What are the methods for thread synchronization in Java? What is the difference between CycliBarriar and CountdownLatch in Java?

The principle of cas, which keyword should be used to modify the variable, and the principle of volatile realization.

What are the common problems you encounter in a multithreaded environment? How did you solve it?

What are the method commands for MYSQL database server performance analysis?

What are common SQL functions?

Shredded code: traverse the binary tree by level?

Configure Spring by Java configuration

What is used in spring, briefly describe the concepts of AOP and IOC, how is aop realized?

The first round is very important. If the first side is passed, the possibility of subsequent employment is relatively high. It is recommended to study the interview questions systematically

Two sides of Yu'e Bao (technical side)

Self introduction & projects

Many projects use Spring. Do you understand the principles of Spring? Principles of AOP and IOC

Principle of Distributed Lock

CAS algorithm, usage scenarios of CAS and synchronized

Concisely describe the names of the four transaction isolation levels supported by InnoDB in Mysql, and the differences between each level?

What problems do they solve?

What modules does dubbo have, and the principle of underlying communication? What are the load balancing strategies for Dubbo clusters?

If you were to implement an https, how would you implement it?

Can you tell me how to use commonly used load balancing?

What are the common distributed transaction solutions?

What is the core function of Dubbo? How to design a Dubbo-like RPC framework from 0 to 1?

Three sides of Yu'e Bao (technical side)

Talk about the consistent hash algorithm (redis)?

Database index, the characteristics of B+ tree and the process of building a tree.

mysql-related row locks, table locks; optimistic locks, pessimistic locks

For the distributed lock scheme, which is better, redis or zookeeper, if it is a cluster deployment, which performance is better in the case of high concurrency.

What are the ways for activeMQ to send messages? How to tune activeMQ

Design patterns and refactoring, talk about your understanding of refactoring

Collections.sort underlying sorting method

Talk about the concept of Redis hash slot? How to choose a database for Redis cluster?

How is the service registration and discovery of Spring Cloud designed?

Four sides of Yu'ebao (technical side)

What are the technically difficult projects in the projects that I have participated in?

Have actual performance optimization experience online?

Talk about optimization ideas from the four aspects of SQL, JVM, architecture, and database, and how to prioritize them?

Redis persistence mode, redis3.0 native cluster and redis read-write separation + sentinel mechanism difference

If you are asked to implement an mq, how to ensure that the message is not lost

Which middleware are you familiar with, talk about your understanding of them, and the corresponding usage scenarios?

Finally, what do you want to ask me?

Yu'ebao roof (HR surface)

What is your personal greatest shortcoming?

What is the biggest challenge encountered in work and life? How was it overcome?

What are the plans for the future?

What are your hobbies?

The above is the summary of the four-sided Yu'ebao Java technical post interview. The following is my personal summary of the interview questions (including answers) frequently asked by major Internet companies in 2020. The pass rate of all the major companies in the interview is extremely high. Of course, it depends on the working years and personal ability. .

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4th Alibaba Yu’ebao Java Advanced Technology Post (take an offer): See what Ali asks?

Multi-threaded interview questions finishing

4th Alibaba Yu’ebao Java Advanced Technology Post (take an offer): See what Ali asks?

MySQL interview questions finishing

4th Alibaba Yu’ebao Java Advanced Technology Post (take an offer): See what Ali asks?

Redis interview questions finishing

4th Alibaba Yu’ebao Java Advanced Technology Post (take an offer): See what Ali asks?

Spring interview questions

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Origin blog.csdn.net/weixin_47066028/article/details/113345199