Wow! These Java repo on GitHub are too strong. After reading them, you will become a big boss!

Hello everyone, I am the second brother who is pretending to be studying.

Today I will share with you some Java knowledge summary projects that make people call "Wow". The second brother dare to say that as long as you read any one of them, you can become a big boss!

Before sharing, feel free to chat about some of the feelings in the snack. The previous article advises students who want to learn programming well! It turned out to be the best article read in the last two months.

Some readers left a message saying that I am very grateful for my previous answers, and helped him out of confusion and ushered in life;

Some readers commented that although the spring recruits were discriminated against and very low, they were full of confidence when they saw my "excellent" role model in the front inspire;

Some readers left a message saying that I am different from the big guys of other prestigious schools, and the article reads more appetite and favorite;

Some university students left a message saying that I was a role model for our specialists;

Some readers left a message saying that they found a job, which is inseparable from my subtle influence;

Many readers left messages saying that I was their role model and they wanted to follow me!

. . . . . .

In short, I feel very warm, and the corners of my mouth are raised when I sleep at night.

Yesterday my sister came to the house from school to play for a meeting, and asked me if I could play the king. I said I didn’t have time to play, she said it was fun, so she played the game next to me, and I was writing an article in my ears. The voice in the game keeps coming: "I want to be quiet~quiet~~" (meaning Luban is dead)

Hey, everyone understand what I mean?

Instead of before, I would definitely criticize her, why don't you study hard, don't think about playing games every day; now I won't, because I want to play too, but I don’t have time, so I cried~~~

Okay, let’s start today’s sharing.

I have already starred in the following Java knowledge summary projects. When I am empty, I will check and fill up vacancies. Although I have learned Java for more than ten years, I still feel that I can gain a lot of new knowledge.

1) JavaGuide

I remember looking at it some time ago, it was still 98k stars. When I took the screenshot today, I found that it was already 100k stars! It's really awesome, after all, there are still many small partners who need Java experience.

I usually have a lot of exchanges with the maintainer of the project, Guide, so I have made recommendations in many other places, such as CSDN and Zhihu. The content of this project is really comprehensive, including Java foundation, container, concurrency, JVM, as well as network, operating system, data structure and algorithm, database, and various commonly used frameworks, such as Spring, MyBatis, Netty, Zookeeper , Spring Boot, etc.

I have compiled the essence of this repo into an offline PDF: V4.0 "JavaGuide Interview Assault Edition" is coming!

2) toBeTopJavaer

Yes, God H’s path to becoming a God in Java, the name sounds very domineering.

Several of his mind maps are of great help to me, giving me a systematic concept of the entire knowledge system of Java. It is highly recommended that you take a look at the knowledge points about concurrent programming in Java, which are very detailed.

  • What is concurrency?
  • The difference between thread and process?
  • Multiple ways to create threads
  • How to design a thread pool yourself?
  • What is thread safety?
  • CPU time slices and atomicity issues
  • Optimistic and pessimistic locking
  • CAS
  • The cause of deadlock
  • How to optimize the lock?
  • How is synchronized achieved?
  • The realization principle of volatile?
  • How to solve the problem of producers and consumers?
  • In-depth understanding of Java's concurrency package

3) advanced-java

The introduction of this project is very impressive-advanced knowledge of Internet Java engineers is completely literate: covering high concurrency, distributed, high availability, microservices, massive data processing and other domain knowledge. It's over, I feel really literate after reading it.

The high-concurrency architecture talked about message queues, such as Kafka, ActiveMQ, RabbitMQ, RocketMQ; talked about search engines, such as ElasticSearch; talked about caching, such as Redis; talked about sub-database and table, separation of read and write, and so on.

Distributed systems talked about system splitting, distributed service framework Dubbo, distributed lock Zookeeper, distributed transactions, distributed sessions, and so on.

The high-availability architecture talks about the high-availability guarantee framework Hystrix, current limiting, fusing, downgrading, and so on.

The microservice architecture talks about Spring Boot and Spring Cloud; the massive data processing talks about how to find high-frequency words from a large amount of data, how to find the median from 500 million numbers, and so on.

4) JCSprout

The author is a friend of mine, crossoverJie, who plays basketball very well and the person is very nice. I remember when I first wrote the official account, my elder brother with a pure smile recommended us both under the same article, and added WeChat at the time. Jie is a technical geek, I really admire his attitude towards technology!

There are not only collections, multithreading, JVM, but also distributed, framework, architecture design, databases, and algorithms. It can be said that there are core knowledge points that an excellent Java back-end engineer should master. It is highly recommended that everyone take a look at the design part of the spike system. If you want to do hand-training projects, this part is a good reference.

5) Java Interview Guide Book

Officially produced by, it is a collection of interview guides specifically for Java programmers. The question bank is compiled from massive data of real school recruitment interview questions.

Although I think some of the contents are outdated, such as XML programming and JDBC programming, on the whole, it is still very helpful to Java interviewers. In my suggestion, you can find a small partner to simulate the interview, either online or face-to-face, and see how many points you can get when answering these real questions.

6) CS-Notes

The knowledge inside is very complete, not only Java, but also LeetCode, computer operating system, computer network, system design, Python, C++.

I recommend you to scan "Sword Finger Offer Problem Solution" and "LeetCode Problem Solution". The code is in the Java version. I plan to organize an offline version by myself when I have time.

I compiled the corresponding Java content into a PDF, which covers all the knowledge points of Java, including Java syntax, Java collection framework, Java IO, Java concurrent programming and Java virtual machine. The content is not much, only the key points .

GitHub starred 124k+ Java tutorial, super hardcore!

7) architect-awesome

The technical map of back-end architects, this name sounds tall and awkward.

The content of the project includes:

  • Data structure, including queues, linked lists, arrays, stacks, trees, etc.
  • Common algorithms, including common sorting algorithms such as selection sorting, bubble sorting, quick sorting, and insertion sorting, as well as greedy algorithms, backtracking algorithms, dynamic programming, etc.
  • Design Patterns
  • Operation and maintenance, including continuous integration (CI/CD), testing, virtualization, container technology
  • Middleware, including Web servers Nginx, Tomcat, Apache, Jetty, as well as timing scheduling, RPC, database middleware Sharding, etc.
  • Network, including HTTP, HTTPS, etc.
  • Database, including MySQL, NoSQL, etc.
  • Search engines, including Solr, Elasticsearch, etc.
  • Performance, including CDN network, performance tuning, etc.
  • Big data, including streaming computing, Hadoop, Spark, etc.
  • Security, including XSS, CSRF, SQL injection, DDoS prevention, encryption and decryption, authentication and authorization, etc.
  • Common frameworks, including log frameworks, network frameworks, etc.
  • Distributed design, including scalability design, stability & high availability, database expansion, service governance, distributed consistency, etc.

These projects contain a lot of content and are very large. If you want to fully understand it, it is obviously not realistic, but as a navigation map of the skills at hand, it is perfect. If you don’t know what to learn at the moment, or If you lose your goal, let’s take a closer look at the key points I have chosen for you.

Especially when you are preparing for an interview, you should brush it intensively for a period of time, and then you should be able to be hard with the interviewer!

In my opinion, there are two types of resources, one is large and comprehensive, and the other is small and refined. In the beginning, when we don’t have a goal and direction, we look at this kind of big and comprehensive one, holding it around like a map, without getting lost; once we have a goal and direction, we need to spend time to go deeper and go deeper. , To understand the bottom and inside story of the technology, and build yourself into a technical expert.

Give yourself more time and more patience. On the way of growing up, we will be with you all the way and no longer be lonely~

I am the second king of silence, I hope this sharing will help everyone, remember to like it ~