After 30 days of suffering, I finally produced the nine core topics of the Java interview and harvested offers from 4 major factories.

Preface

I started a business with two friends at the end of last year and lost 100,000 yuan. I had no choice but to find a job again, because I feel that I still have the strength, otherwise I would not choose the path of starting a business. I was fortunate to receive ByteDance this year. I deliberately smoothed out my interview experience, summed up a lot of experience, and compiled some collections of materials that helped me very much, involving a total of nine major offers. The core topics are computer networks, operating systems, MySQL, Linux, JAVA, JVM, Redis, message queues and distribution, and website optimization. I stayed up all night for 23 days to finish reading them. I hope it can help you too. If you have other good topics or good insights, welcome to share.

Reference analysis: Third Prince Ao Bing, Hollis, IT Ranch, Meituan Technical Team, Didi Technical Team, Ant Financial Team, Tencent Class...

Content features: Clearly organized, with graphical representations that are easier to understand.

After 30 days of suffering, I finally produced the nine core topics of the Java interview and harvested offers from 4 major factories.

Core 1: JVM

JVM is the foundation that a developer needs to master. It allows you to understand the underlying things instead of staying at the code level. You can mainly understand the importance of heap, stack, method area, garbage collection, bytecode instructions, etc. I won’t talk about it much, but the specific application can be seen below

After 30 days of suffering, I finally produced the nine core topics of the Java interview and harvested offers from 4 major factories.
After 30 days of suffering, I finally produced the nine core topics of the Java interview and harvested offers from 4 major factories.

Core 2: Java

Java is not only a powerful, safe, cross-platform, international programming language, but it is also being continuously expanded to provide more language functions and class libraries, which can be elegantly processed in traditional programming languages Problems that are difficult to solve in Java, such as concurrency, database access, network programming, and distributed computing, are also deliberately compiled here for reference.

After 30 days of suffering, I finally produced the nine core topics of the Java interview and harvested offers from 4 major factories.
After 30 days of suffering, I finally produced the nine core topics of the Java interview and harvested offers from 4 major factories.

Core Three: Operating System

Regarding the part of the operating system, there are not many questions, mainly because this part asks about the same questions, such as thread communication, the difference between threads and processes, process scheduling algorithms, virtual memory, and physical Memory, etc. Therefore, in this regard, I have also sorted out some relatively core content.

After 30 days of suffering, I finally produced the nine core topics of the Java interview and harvested offers from 4 major factories.
After 30 days of suffering, I finally produced the nine core topics of the Java interview and harvested offers from 4 major factories.

Core 4: Computer Network

For fresh graduates and developers with little work experience, there are more questions about computer network related content, especially the protocols involved, such as http, https, tcp, udp, arp, icmp, three-way handshake Wave four times and so on. In an interview with a big factory, computer networks are a must, so what do you need to learn if you want to get this part?

After 30 days of suffering, I finally produced the nine core topics of the Java interview and harvested offers from 4 major factories.
After 30 days of suffering, I finally produced the nine core topics of the Java interview and harvested offers from 4 major factories.

Core Five: MySQL

Not to mention MySQL, mysql is a relational database system that can be used on various popular operating system platforms (relational database rdbms is a basic tool in many environments, especially now Internet companies, which are basically used MySQL, MySQL naturally asks the most about indexes, locks, and optimization methods. Of course, you may also ask you some commands, such as checking the execution plan of sql, the difference between engines, the advantages and disadvantages of auto-incrementing primary keys, and B+ trees.

After 30 days of suffering, I finally produced the nine core topics of the Java interview and harvested offers from 4 major factories.
After 30 days of suffering, I finally produced the nine core topics of the Java interview and harvested offers from 4 major factories.

Core Six: Linux

Without linux, it is possible that the world will have to use expensive windows service systems. This product is almost the same as the usual Windows series. Linux is that it is light and fast. It can be customized without viruses (except that you are a root squad). If you don’t want to toss it. There are professional green hats to help you configure the server and various security updates. Although it is expensive, it is more professional. After all, the most profitable Linux company is not built. During the interview, the most frequently asked questions are the process and network-related commands. There are commands related to troubleshooting, zombie processes, orphan processes, etc.

After 30 days of suffering, I finally produced the nine core topics of the Java interview and harvested offers from 4 major factories.

Core Seven: Website Optimization Related

When the scale of our website is relatively large, at this time, we need to consider a lot, and we need a variety of optimizations, such as caching, sub-database and table, load balancing, etc. Regarding the issue of website size, In fact, I have also been asked several times. For example, when we usually visit Zhihu, sometimes a certain question is very popular, and it becomes hundreds of millions of times. How will we come out with this kind of problem? How to optimize?

After 30 days of suffering, I finally produced the nine core topics of the Java interview and harvested offers from 4 major factories.

Core Eight: Redis

Interviews will also examine actual projects, and Redis is used in many projects because it is easy to use. However, Redis has a lot of theoretical content, and the principles must be studied in depth. So what should Redis review? At least the following must be mastered.

After 30 days of suffering, I finally produced the nine core topics of the Java interview and harvested offers from 4 major factories.
After 30 days of suffering, I finally produced the nine core topics of the Java interview and harvested offers from 4 major factories.

Core Nine: Message Queuing and Distributed

The first and second sides of the interview will generally ask questions based on your actual project situation. My project involves message queues, so I also specially prepared the message queue part before the interview. The main points involved in the message queue include message queues, distributed locks, sub-databases and sub-tables, etc. I also specially compiled a mind map for these contents. It is basically no problem to review the main points on the map.

After 30 days of suffering, I finally produced the nine core topics of the Java interview and harvested offers from 4 major factories.

In fact, in addition to these nine core topics, I have also compiled a collection of other related technical points, such as Spring Family Bucket, Tuning, BAT and other first-line Internet companies interview questions. This will not be listed one by one.

After 30 days of suffering, I finally produced the nine core topics of the Java interview and harvested offers from 4 major factories.
After 30 days of suffering, I finally produced the nine core topics of the Java interview and harvested offers from 4 major factories.

At the end of the article

For programmers, there are too many knowledge content and technology to learn. If you don't want to be eliminated by the environment, you have to constantly improve yourself. It is always us to adapt to the environment, not the environment to adapt to us!

Attached here are dozens of sets of interview questions from Tencent, Toutiao, Ali, Meituan and other companies related to the above-mentioned technical system diagram. The technical points are organized into videos and PDFs (actually a lot more energy than expected) , Including knowledge + many details, due to limited space, here is a part of it in the form of pictures. Want to get here

I believe it will bring you a lot of gains!