Everyone knows that programmers' salary increases mainly depend on job-hopping! But we all know that whether it is an exam or a job search, the difficulty and the number of participants are a big factor that affects the difficulty (of course, the most powerful boss can ignore this sentence).

The number of people in the college entrance examination and postgraduate entrance examination is increasing every year, and the number of job seekers must also increase every year. Therefore, even if there is no new technology at all, it will become more and more difficult to find a job .

Recently, I chatted with many friends who went out for interviews, and found that the knowledge points related to JUC and JVM were added points when interviewing for advanced development two years ago, but now it has become a basic requirement. Get up and fight!

Two years ago, some theoretical knowledge of JVM, such as the concept of garbage collection algorithm, advantages and disadvantages, applicable scenarios, etc., have reached a passing level. Now that there are more people, this screening is more difficult, and now they are starting to ask, have you done any JVM tuning?

As we all know, the number of developers in the company is relatively large. Even if there is a JVM problem, the number of people involved in tuning is limited. It is impossible for a company to be like a university , where everyone can be in the laboratory, and then each student can do the experiment in person, and then the teacher will grade it and so on.

The reality is that many of my classmates' companies do not have JVM tuning scenarios at all. Even if there is, you will not have the opportunity to participate in the solution. The current interview situation is that if you do not, you will likely be "manslaughtered".

Of course, the JVM is just an example, such as a high concurrency scenario. Many classmates and companies do not have this scenario at all, and even if there is, it is only the core personnel who participate in the solution . It is impossible to be like a university laboratory. Everyone has to participate in person, and then the class can be dismissed after completion. .

It is precisely this that leads to more and more opportunities for outstanding people. Although life is a long road, many times, when you fall behind in a certain period, it may be difficult to catch up in the future .

Everyone's situation is different, so how to work hard and plan in the future is also different. But even if there is no actual combat scene or opportunity for actual combat, it is still too late to work hard now.

It is necessary to have basic theories. In case one day the boss needs personal help when he investigates, but you happen to have the relevant knowledge reserve, then people will naturally think of you.

But if you don't know at all, it really has nothing to do with high concurrency, JVM tuning, Redis, etc. Therefore, a mind map is provided here to facilitate everyone to check and fill in the gaps, systematically study first, and establish a knowledge system.

Multithreading and high concurrency:

JVM tuning

cache

Microservices

For the knowledge points on the mind map, the editor has collected and organized a lot of learning materials and interview materials to help you prepare for the interview. After friends in need help and like, you can privately message me [Learning] (be sure to follow me, otherwise you will not be able to reply to strangers' private messages).

Interview questions and analysis

Summary of actual combat notes

Factory interview scene