Preface
Is the interview difficult or not? Is the final result good or bad? It depends on the interviewer's background (aura + skills), mentality and cognition, and communication skills. And some mainstream large-scale Internet company interviews require you to show your abilities during the interview, so as to gain the appreciation and recognition of the interviewer.
And programmers need to go through layers of interviews when applying. As the saying goes, sharpening the knife and not cutting firewood by mistake, and preparing for the interview can help everyone better deal with the interviewer’s questions and unexpected situations during the interview.
Many people prepare for technical interviews and use a large number of "Java Interview Written Test Questions" on the Internet. Today, the editor also prepared a set of interview questions for Pinduoduo JAVA programmers. Friends can try it. Detailed need answers can be directly click here reply signal: CS free access!
one side
Brief introduction
ACID of the transaction, which explains the isolation of the transaction in detail
Dirty reading, phantom reading, non-repeatable reading
Red-black tree, binary tree algorithm
Which collections are commonly used? What is the difference between ArrayList and LinkedList? The internal data structure of HashMap? ConcurrentHashMap segment lock?
What optimizations have been made to hashMap and concurrentHashMap in jdk1.8
How to resolve the hash conflict, and if there is a conflict, how to find the target value in the hash table
The difference between synchronized and ReentranLock?
ThreadLocal? Application scenario?
Java GC mechanism? What are the GC Roots?
Will there be deadlocks in MySQL row locks?
Two sides
Do you understand optimistic locking and pessimistic locking? What is involved in optimistic locking and pessimistic locking in JDK?
Nginx load balancing strategy?
Have you compared Nginx with other load balancing frameworks?
Is Redis single threaded?
The reason for the high concurrency of Redis?
How to use Redis to process hot data
Talk about Redis sentinel, replication, cluster
What technology has been optimized at work? Talk about JVM, MySQL, code, etc.
Three sides
What does Spring Cloud use? How to achieve load balancing? How to judge if the service is down?
Network programming nio and netty related, netty thread model, zero copy implementation
What do you know about the implementation of distributed locks? Talk about an implementation method in detail
In high-concurrency application scenarios, what does the technology need to involve? How to design the architecture?
Next to the issue of high concurrency, it talked about the technical applications of spikes: kafka, redis, mycat, etc.
Finally, talk about the projects you have participated in, those with relatively high technical content, related architecture design and what core coding you are responsible for
Java programmer project introduction note
When asked about project experience, it is not the technology that is examined, but your project overview ability. Follow the steps below:
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Starting from the life cycle of a project as a baseline, this introduction is more layered. Next, what is your proportion in the project and what are the main points you are responsible for.
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After the project overview, it is necessary to discuss the difficult part encountered in the process of each project, because most projects will encounter this problem, so try to truly describe how you solved the problem, which will also reflect your problem-solving thinking .
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Politely ask the interviewer about any questions or unclear points about the project.
offer = mentality* (hard power + soft power) + fate luck. Everyone experiences continuous interview failures and then summarizes, optimizes the interview experience, and enhances the technical depth, so as to find a job that you like. The BAT interview tour helps!
About knowledge combing
How well you prepare for your knowledge directly determines whether you can successfully pass one side and two sides, so it is necessary to sort out your knowledge before the interview and see if you need to improve your knowledge reserve.
Regarding knowledge sorting, I myself have divided it into the following parts :
- Concurrent programming: multithreading + high concurrency + CAS + lock + thread pool bottom layer, etc.
- Performance tuning: I/O and network tuning + algorithm tuning + JVM tuning + MySQL tuning + Tomcat tuning
- Spring family bucket: Spring+SpringMVC+Spring5.x core mechanism source code
- NoSql cache architecture: redis+mongoDB
- Distributed & microservices: SpringBoot+SpringCloud+docker+maven+git
After the knowledge is sorted out, it is necessary to check and fill in the vacancies. Therefore, for these knowledge points, I have prepared a lot of e-books and notes on hand. These notes perfectly summarize each knowledge point:
Last blessing
Why should programmers enter the big factory, and should enter the big factory as soon as possible? 6 key words, summarizing the importance and necessity of entering a big factory: fairness, growth, pattern, value, circle and additional.
After reading these 6 keywords briefly, I believe you also have your own thoughts. Not much nonsense, respect personal choice, hope everyone can achieve their goals and values, whether you enter a large factory or not, but being a qualified and excellent programmer is your professional ethics!
Finally, the article related to the interview Zhenti analysis and study notes and other documentation pdf, can receive free, in need can click directly here, is here, reply signal: CS can receive a free! ! ! (Full of sincerity)
