It was not easy to change jobs at the beginning of the year. I ended up with 8 companies and finally got the byte offer

Preface

I recently talked to many people about job-hopping at the end of the year, and an obvious feeling for me is that this year's Java technology stack interview, both on one side and on two sides, is a test of technical skills. Especially the first-line Internet companies are increasingly demanding programmers, and many friends who want to change jobs and raise their salary repeatedly hit the wall and even began to "self-doubt."

 

 

Frankly speaking, big companies like Ali, Tencent, Meituan, ByteDance, etc., regardless of salary, technical atmosphere and technical standards, are significantly better than some entrepreneurial companies/small companies. If there is a chance, The company has exercised for several years and believes that it has greatly improved its own capabilities.

Today’s article will talk about "how to hop to a big factory" , and hope to provide you with timely help.

What kind of people do big companies favor?

Judging from the requirements for Java engineers in the recruitment information of large companies such as Alibaba and Tencent, we can probably summarize the requirements of large companies for recruiters.

Let's take Alibaba as an example to look at the actual requirements of big factories:

 

We can see that, in fact, the requirements of major manufacturers are mainly concentrated in two aspects.

The first is to examine your mastery of basic knowledge (including the breadth, depth, enthusiasm for technology, etc.), because basic knowledge determines the upper limit of the development of a technician ;

The second is to examine your engineering capabilities, such as: what projects have you done? How to solve the most difficult problem? Talk about the most fulfilling task? Engineering ability is to examine the benefits you can bring to the company right now .

How to win a high-paying offer from a big factory?

But the problem is also coming. In daily work, it is difficult for us to have the opportunity and method to systematically study and improve these abilities.

Many people basically have no chance to get in touch with large-scale website architecture, and it is difficult to have a platform for us to put the theory into practice. It’s just a lesson in a book and a lesson in the video. If something goes wrong, I don’t know who to ask, let alone get an offer from a major company.

In such a "difficult" environment, how can we technical people improve ourselves?

The editor here has compiled a collection of interviews with major companies such as Alibaba, Tencent, ByteDance, and Toutiao. The general knowledge points are: JVM, JAVA collection, JAVA basics, Spring principles, microservices, Netty and RPC, networks, logs, Zookeeper, Kafka, Hbase, MongoDB, Cassandra, design patterns, load balancing, databases, algorithms, distributed caching, machine learning, cloud computing, etc. . . . This interview question is sufficient to deal with most of the Java interviews currently on the market, because this article has already covered a lot of knowledge in terms of depth and breadth.

JVM

basic concept:

JVM is a hypothetical computer that can run Java code, including a bytecode instruction set, a set of registers, a stack,

A garbage collection, heap and a storage method domain. JVM runs on the operating system, it is not directly related to the hardware

Interaction.

1. Thread
2. JVM memory area
3. JVM runtime memory
4. Garbage collection and algorithms
5. JAVA four reference types
6. GC generational collection algorithm VS partition collection algorithm
7. GC garbage collector
8. JAVA IO / NIO
9. JVM class loading mechanism

Information acquisition method: follow the editor + forward the article plus VX: mxj94670 to obtain the above information

 

JAVA collection

1. Interface inheritance and implementation
2. List
3. ArrayList (array)
4. Vector (array implementation, thread synchronization)
5. LinkList (linked list)
6. Set
7. HashSet（Hash表）
8. TreeSet (binary tree)

 

 

JAVA multithreaded concurrency

1. JAVA Concurrent Knowledge Base
2. JAVA thread implementation / creation method
3. 4 types of thread pools
4. Thread life cycle (state)
5. 4 ways to terminate threads
6. The difference between sleep and wait
7. The difference between start and run
8. JAVA background thread
9. JAVA lock
10. Basic thread method
11. Thread context switch
12. Synchronization and deadlock
13. Principle of Thread Pool
14. .JAVA blocking queue principle
15. .CyclicBarrier. CountDownL atch. Usage of Semaphore
16. The role of the volatile keyword (variable visibility, reordering prohibited)
17. How to share data between two threads
18. ThreadLocal role (thread local storage)
19. The difference between synchronized and ReentrantL ock
20. ConcurrentHashMap concurrency
21. Thread scheduling used in Java
22. Process scheduling algorithm
23. What is CAS (compare and swap-optimistic locking mechanism locks spin)
24. What is AQS (Abstract Queue Synchronizer)

Information acquisition method: follow the editor + forward the article plus VX: mxj94670 to obtain the above information

 

JAVA basics

1. JAVA abnormal classification and treatment
2. JAVA reflection
3. JAVA annotation
4. JAVA inner class
5. JAVA generic
6. JAVA serialization creates reusable Java objects
7. JAVA copy

 

Spring principle

1. Spring features
2. Spring core components
3. Spring common modules
4. Spring main package
5. Spring common annotations
6. Spring third-party integration
7. Spring 1I0C principle
8. Spring APO principle
9. Spring MVC principle
10. Spring Boot principle
11. JPA principle
12. Mybatis cache
13. Tomcat architecture

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Microservice

1. Service registration discovery
2. APL gateway
3. Configuration Center
4. Event scheduling (kafka)
5. Service tracking (starter- sleuth)
6. Service Fuse (Hystrix)
7. API management

 

Netty 与RPC

1. Netty principle.
2. Netty high performance
3. Netty RPC implementation
4. RMI implementation
5. Protoclol Buffer
6. Thrift

 

Due to space limitations, the detailed information of the pdf document is too comprehensive, and the details are too much, so only some of the knowledge points are screenshots for a rough introduction, and each small node has more detailed content! Please see the outline below:

Information acquisition method: follow the editor + forward the article + VX: mxj94670 to obtain the above information

to sum up

Opportunities are always reserved for those who are prepared. In life, no matter what we do, we should not fight unprepared battles. We will not waste every opportunity and do everything we can to do everything we can, even if the results are not exhausted. If you like it, you will not regret it. When we walk out of the tortuous days, we will discover that the true beauty and magic have been left behind forever.