In 2021, the Java programmer industry is getting more crowded, and interviews are getting more difficult. This year, there are a lot of people who are moving from Java to other industries, and there are a lot of people who are trying to get a piece of the market. Year after year, year after year. Of course, Java programmers are still in high demand, and there are many opportunities for advancement in Java jobs. But on the other hand, senior talent shortage, many even have work experience of programmers are not up to the requirements of large factory recruitment, compared to Ali, see you from senior talent still a few steps?I’ve been trying to come up with the perfect interview guide, but I’ve been running out of timeMore than 1000 interview questions treasure book, combined with this year’s gold three silver four various big factory interview questions, as wellGitHub files with more than 30K+ starsAfter I uploaded it, the number of likes reached 13K in just half an hour without any accident. To be honest, it is still a little incredible.

And, on the one hand, I can help my friends who are preparing for the interview, because I have prepared more than 1,000 questions for the interviewPrimary – intermediate – senior three levels of big factory interview real questions, so you can try your level and see yourself in which section?

1000 Internet Java engineer interview questions

Content covers: Java, MyBatis, ZooKeeper, Dubbo, Elasticsearch, Memcached, Redis, MySQL, Spring, SpringBoot, SpringCloud, RabbitMQ, Kafka, Linux, etc. Page 485)

Primary – intermediate – senior three levels of big factory interview real questions

Ali Cloud — Java Intern/Beginner

How is a HashSet guaranteed not to be repeated

Is HashMap thread safe, and why not?

Expansion process of HashMap

What is the difference between HashMap 1.7 and 1.8?

Four kinds of references to objects

Java gets reflection in three ways

Java reflection mechanism

Arrays.sort and collections. sort

Cloneable interface implementation principle

Exception classification and handling mechanism

The difference between ‘wait’ and ‘sleep

How are arrays allocated in memory

Answer display:

Meituan – Java Intermediate

What’s the difference between BeanFactory and ApplicationContext

The life cycle of Spring beans

How is Spring IOC implemented

Tell me something about the Spring AOP

Implementation principles of Spring AOP

Dynamic Proxy (Cglib and JDK)

Spring transaction implementation

Underlying principles of Spring transactions

How do I customize the annotation implementation

Spring MVC runs the process

Spring MVC startup process

Spring’s singleton implementation principles

What design patterns are used in the Spring framework

Why Netty

This section describes the Netty application scenario

The native NIO has an epoll bug in JDK 1.7

What is TCP sticky/unpack

TCP sticky/unpack solution

Netty threading model

Talk about Netty’s zero copy

Netty internal execution process

Answer display:

Ant Financial — Java Advanced

Topic 1:

  1. What has changed between JDk1.7 and JDk1.8 Map (bottom level)?

  2. ConcurrentHashMap

  3. What’s the difference between parallelism and concurrency?

  4. What has changed between jdk1.7 and the jdk1.8 Java virtual machine?

  5. If you were asked to design a piece of middleware yourself, how would you do it?

  6. What is middleware?

  7. Have you used ThreadLock before? What does it do?

  8. Is Hashcode () different from equals () and ==?

  9. In a mysql database, when an index is set but cannot be used?

  10. Mysql optimization will not,mycat, vertical, horizontal branches?

  11. Distributed transaction solution?

  12. SQL statement optimization will not say what you know?

  13. Mysql storage engine

  14. Red black tree principle?

Topic 2:

  1. What are the three distributed locks?

  2. How does Redis work?

  3. Redis data structure, usage scenarios?

  4. What are the types of Redis clusters?

  5. Codis principles?

  6. Are you familiar with financial business? Bookkeeping? Ant Financial has requirements for this part.

Good ~ show finished, probably estimate oneself is bronze or king?

Some time ago, while chatting with group friends, I sorted out some different kinds of interview questions they saw this year, so I have the following set of questions, and also share with you ~

Available on GitHub: JAVA Architecture Crash Notes

Based on article

The JVM article

MySQL article

Redis article

Due to space limitations, detailed information is too comprehensive, too many details, so only part of the knowledge point screenshots out of the rough introduction, each small node has more detailed content!

Available on GitHub: JAVA Architecture Crash Notes