In 2021, the latest sharing of bytes has successfully got an offer from all sides!

Preface

Five years ago, BAT rushed to the forefront. The US-listed Ali became China's largest Internet company. Tencent used WeChat to become the overlord of the mobile Internet. Foreign companies began to withdraw from China, and the aura of state-owned companies slowly faded.

In recent years, the most popular companies in the hearts of fresh graduates have been replaced by TMD and various unicorn companies. These companies represent the forefront of technology and can promise high salaries and bright prospects.

And bytedance has become my life goal.

Today, through 4 sides, I finally "jumped into" Bytedance, and I won the Bytedant offer thanks to my own step.

Note: The following interview questions about byte beating answers + analysis, Java learning materials, e-books, mind maps, videos, interview questions, etc., are all stored on the disk, just click the portal if you need it ! !

 

After 4 sides, "jump in" byte beating

Byte beating side:

• Self introduction
• The difference between tcp and udp, application scenarios
• Why is there a third handshake for tcp three times?
• Talk about the difference between get and post, other commands
• Talk about the difference between process and thread, when to use multithreading? How to ensure thread safety?
• What is the use of synchronized to lock?
• Stacks and queues, how to use stacks to implement queues?
• Garbage collection algorithm, what should I do if there are too many surviving objects in the replication algorithm?
• Reachability analysis, what objects can GC Root be?
• The underlying implementation of hashmap, the put get process, and capacity expansion, why is the capacity a multiple of 2?
• Java basic types, conversion between basic types (short+int gets the int type, you cannot directly assign the int type to the short type)
• String class, the underlying operation of string addition +, StringBuilder and StringBuffer
• Algorithm: Give an array, make the odd numbers of the array in the first half and even numbers in the second half, and operate on the original array.

Two sides of byte beating:

• The technical architecture of multiple projects, not the business architecture MySQL, Redis, Nginx, Kafka and other technical architectures
• What have you learned about the technical points of the project? Specific knowledge points are also required.
• Why is the leftmost prefix in MySQL?
• Have you ever touched some automatic fusing tools
• What are the possible reasons for 502?
• How to troubleshoot online issues? What should I do if Full GC is frequent?
• The QPS of the service, the architecture and version of the database.
• Analysis of the advantages and disadvantages of SpringBoot
• Analysis of the startup source code of SpringBoot
• How is the service deployed?
• Algorithm topic: traverse the binary tree hierarchically according to the zigzag pattern, require bug free, and construct the binary tree for testing.

Byte beating on three sides:

• The default garbage collector of jdk8, which garbage collectors do you know? G1 talk about it in detail
• What is the underlying of the synchronized keyword?
• Which resources are shared between threads? What is exclusive?
• What is the difference between heap and stack?
• Linux command to view resources? How to check which ports are occupied
• What is swap in linux memory? What is it for?
• The difference between user mode and kernel mode? Why is there a difference between user mode and kernel mode?
• What are the types and differences of interrupts?
• Deadlock concept? condition?
• Algorithmic problem: arrays with increasing odd digits and decreasing even digits, sorted
• What is the difference between get and post?
• Can get cached? How is it implemented in INTP (? Didn't understand where)?
• Write sql, group by query?
• mySQL search engine? The difference between innodb and myISAM

HRBP surface:

• Self introduction
• Why are you looking at opportunities? What type of opportunities are you looking at?
• Why look at the headlines?
• What kind of company do you think Toutiao is?
• How do friends and colleagues evaluate you?
• What are your hobbies?
• When was the most enjoyable stage in the original company? why
• Do you know our business direction?
• Are you interested in our business direction and technology?

Absorb experience, refer to summaries, make plans, and implement actions

The so-called list of plans is actually to have a clear goal and steps in our learning method. No matter what type of study you are, you must have a set of your own learning plan, otherwise it is easy to appear "no purpose "Case.

So how should a plan be formulated? The following is one step of my plan:

Step1: Time planning

The first step is to have a time plan of your own. The so-called time plan is actually time management. For example, when you want to learn a certain technology stack, specify a time period and require it to be completed by yourself.

Attach a time planning table from my previous time:

 

 

Step2: List the knowledge points to be learned

List the knowledge points to be learned, first list the technology stack that we are learning, and then what knowledge points we need to learn about this technology stack. For example, if we want to learn Redis, then in addition to the basic part of Redis, we need to understand caching and persistence. Mechanism, avalanche, penetration, etc. More advanced techniques include BloomFilter, RedisSearch, and Redis-ML.

• Java core knowledge points:

 

Step3: Draw a brain map (Xmind)

In the process of learning, we have to learn how to draw brain maps. This is a habit I have always maintained, because a clear structure diagram can sort out our thinking, can understand clearly, how to learn? How to learn well? How much did you learn?

• Take the Redis brain map as an example:
• In addition to the Redis brain map, I also compiled Spring, SpringBoot, MySQL, JVM, Kafka, Docker and other related brain maps.

 

Step4: Take notes

As the saying goes, good memory is not as good as bad writing. In fact, taking notes is very important for each of us. Whether it is reading some technical documents or brushing interview questions, I think that the feelings are deeper, you can record it, and then When you go to read, there will be different inspirations. Of course, I mainly made some notes on the use of classes, such as SpringBoot notes, Redis notes, etc.

• Java core knowledge notes:

 

Step5: Reading a book (e-book)

The book has its own golden house. No matter what books you read, you will improve yourself. There are too many programming books. It is really not convenient to buy physical books. Therefore, it is recommended that you can browse some pdf documents in normal times. Most of them People's reading habits are gradually turning to e-books. I have read a lot of e-books myself. There are many types of actual combat and source code interpretation.

• SpringBoot actual combat:

 

• Deep analysis of Spring source code:

 

Step6: Watch the video

If you can’t read the book, then watch the video. I believe there are still many friends who like to learn from the video~ Regarding the video, I will occasionally scan it after get off work. There are many video courses of the big guys in the network disk. To be honest, it is indeed much more efficient than reading a book, and many unintelligible questions can be resolved at once.

 

 

Step7: Brush the questions

Regardless of social recruitment or school recruitment, it is still good for me to brush up the questions, and I have at least an understanding of what to ask in interviews with Dachang. There are many ways to brush questions, so depending on your own choice and habit, you can go to some cattle website to brush questions, but some cattle website is for school recruitment. If the position is more advanced, it is recommended to find resources. .

I also have some advanced Java interview questions on hand, including those from major BAT manufacturers, as well as some special topics. If you need them, you can trust me privately.

 

to sum up

It's always shallow on paper, only practice leads to true knowledge.

Having said so much, I hope you can get some of it. In fact, I want to emphasize the importance of learning. All the above information can be shared with everyone for free, I hope to make progress together, and friends in need can click the portal to get it! !

Finally, don’t forget to forward+comment+follow, just click on the portal ! !