I was in CRUD for 5 years. By chance, by coincidence, I got the 888-page Java King’s Core Collection by coincidence. My magical work was first achieved, level "P6".

I have something to say, please read it carefully

I found a phenomenon that many programmers who have been developing for 5 years are still stuck in the crud stage. What is the reason?

The main reason is that the foundation is very poor, especially for JVM and concurrent programming . JVM and concurrent programming are very, very important foundations. As a Java developer, if you have a good grasp of JVM and concurrent programming Bad, then you can't write high-quality code. To put it bluntly, you can only do crud work. The ideal job and salary are irrelevant to you, and it is easy to be eliminated by the industry!

Nowadays, big factory interviews must start from the basics. Below I have also posted Ali’s requirements for recruiting Java developers. You can look at them in detail. The following are the real interview questions for Ali. See how many answers you can get right?

• Garbage collection algorithm in Java?
• What kinds of garbage collectors are there, and what are their advantages and disadvantages? What is the difference between cms and g1?
• What is a blocking queue? What is the realization principle of blocking queue? How to use blocking queues to implement the producer-consumer model?
• What is the implementation of concurrent containers?
• What is a thread pool? Why use it?

 

I have emphasized the importance of the foundation more. If you want to get an offer from Ali p6 post, you can't get it with a solid foundation. At this time, you need to learn Java technology in multiple dimensions, depth and breadth , not much Having said that, let's get dry goods directly!

Summary of Java basic core notes

Due to space limitations, I only use screenshots to show the contents of the catalog and part of the notes. To get the full version of the King-level Core Collection, just click forward + follow the official account at the end of the article to get the way to receive it!

In this part, we summarized the basic knowledge of Java, covering: overview, development environment, development environment configuration, basic syntax, execution control flow, object-oriented, access control permissions, interfaces and abstract classes, exceptions, internal classes, collections, general Shape, reflection, enumeration, I/O, etc.

table of Contents:

 

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Java comprehensive study notes

In this section, I summarized 95% of Java's knowledge points, covering from the simpler to the deeper: JVM, Java collections, multi-threaded concurrency, Spring family bucket, Tomcat, MyBatis, microservices, network, Netty and RPC, database, ZooKeeper, MQ, Nginx , Data structure and algorithm, etc.

table of Contents:

 

 

The above (Figure 1) overall outline catalog contains the detailed analysis in Figure 2. Due to the excessive content, I will not show it in detail here. The full version of the ultra-clear version can also be forwarded to the official account at the end of the article to get the download method!

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Summary of essential knowledge points for 2020 Java intermediate and advanced interviews

In this section, we summarize the common interview questions of Java so far in 2019, take the core of the interview and compile this document note, analyze the interviewer’s psychology and figure out the interviewer’s "routine", it can be said that more than 90% of Java Intermediate and senior interviews are not that difficult.

The content summarized in this section covers: message queue, Redis cache, sub-database and sub-table, separation of read and write, design of high concurrency system, distributed system, high availability system, SpringCloud microservice architecture, etc. A series of knowledge points of mainstream Internet advanced technologies .

table of Contents:

 

(The above is just an overall catalog outline, each point has the detailed content as shown below, a process from interview questions-analysis of interviewer psychology-analysis of interview questions-perfect answer)

 

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Finally want to say

For everyone who is doing technology, learning cannot be stopped. The editor has refined the core knowledge of Java so far in 2019, no matter what stage you are at now, as you can see, the content of this document does not matter Is it perfect for you to find an interview job or to enhance the breadth and depth of your technology.

If you don't want to be eliminated by the waves, please get up quickly . The full HD version has a total of 888 pages. If you need it, you can forward it + follow the official account below to get it!

For a programmer with 3-5 years of development experience, do you really want to be a crud for a lifetime? I think the pressure of life can be turned into motivation, and encourage each other!