Everyone knows that programmers' salary increase is mainly accomplished by 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 affecting the difficulty (of course, very powerful bosses can ignore this sentence).
The number of college entrance examinations and postgraduate entrance examinations is increasing every year, and the number of job seekers will inevitably increase every year. Therefore, even if there is no new technology at all, job hunting will become more and more difficult .
I recently chatted with many friends who went out for interviews. I found that I tried advanced development two years ago . Knowledge points related to JUC and JVM are all bonus points. Now it has become a basic requirement. If you don’t know these, the interviews are all suspended. Get up and fight!
Two years ago, JVM acquired some theoretical knowledge, such as the concept of garbage collection algorithm, advantages and disadvantages, applicable scenarios, etc., which have reached the passing level. Now that there are more people, this screening is more difficult, and now I start to ask, have you done any JVM tuning?
Everyone knows that 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 every student can do the experiment in person, and then the teacher can give scores.
The reality is that many of your classmates’ companies do not have a JVM tuning scenario at all. Even if there is, you will not have the opportunity to participate in the solution. The current interview situation is that you will not be killed by mistake.
Of course, JVM is just an example, such as high concurrency scenarios. Many classmate companies don’t have this scenario at all, and even if there are, the core personnel will participate in the solution . It is impossible to be like a university laboratory. Everyone must participate in person and then finish the class. .
It is precisely this that leads to more and more opportunities for outstanding people. Although life is a long way, many times, if you fall behind in a certain period, it may be difficult to catch up in the future .
Everyone's situation is different, so how we work hard and plan in the future is also different. But even if there is no actual combat scene or opportunity for actual combat at present, it is still too late to work hard now.
It is necessary to have basic theories. In case one day when the boss is investigating, you just need personal help, but you happen to have relevant knowledge reserves, 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, and Redis. Therefore, a mind map is provided here to facilitate everyone to find out and fill in the vacancies, learn systematically first, and establish a knowledge system.
Multithreading and high concurrency:
JVM tuning
Cache
Microservice
Aiming at the knowledge points on the mind map, the editor collected a lot of learning materials and interview materials to help you prepare for the interview. After a friend in need helps to like, you can send a private message to me [study] (be sure to follow me, otherwise there is no way to reply to a stranger's private message).
Interview questions and analysis
Summary of actual combat notes
Dachang interview scene
