Writing in the front
Java programmers are proudly the most diverse group of engineers in the world. In the latest ranking of programming languages, the first is still Java, visible Java strong vitality.
However, I found that many of my programmer friends only use The Java language and the technical framework in the Java ecosystem to implement functions, and few of them understand the operation mechanism of JVM, the underlying power of Java, so that their technical level and cognition stagnated and eventually became CRUD researchers.
Recently, when I saw some job descriptions in the recruitment season, I found that most of the job descriptions paid special attention to the mastery of one knowledge, namely JVM, and then distributed, cache and other knowledge requirements.
Xiaobian analyzed some JD and made a word cloud according to the frequency of the words that appeared in the job requirements:
Interview brush also has the role of temporary memory and consolidation, but the real ability or to rely on the usual learning and accumulation, only learn more, the thorough mastery of technology, will be in the interview when the crisis is not chaos, calm. Sometimes it works, but sometimes it doesn’t!
At the same time, it also provides a detailed architecture path for those Java programmers with 2 to 5 years or more of work experience who want to advance to a certain level of technology and even want to develop into an architect. The architecture map is comprehensive from breadth to depth. Inside the technology includes Java high concurrency, micro services, source code analysis, source code analysis, high performance, distributed technology, these are currently more commonly used technology Internet enterprises, then to take a look in detail.
JVM and performance optimization
The JVM is the foundation of the Java language, and although it may not be used much in your daily work, a programmer who wants to move up to a higher level must know how Java actually works. If you want to move from add, delete, change, review and simple development to Java performance analysis and tuning, then the Java Virtual machine is a powerful tool. The reason to learn the Java Virtual Machine is, in essence, to see how Java programs are executed and optimized. That way, you can program efficiently from the inside. At the same time, you can also learn deeper, more core Java technology foundation.
Framework source code interpretation
I think there are three dimensions: what problem was this framework created to solve? What is the core idea of this framework? What scenarios does this framework apply to? Speaking of thought, I think the soul of programming is thought, and programming without thought is no different than salt fish. “Don’t reinvent the wheel” sounded grand at the time, but NOW I think it can only be true in one respect.
Me, why should learn above all how to make the wheel – because you will be made after the wheel, using someone else’s wheels would understand the principle, and use it every time you will be well, if you are in a framework to understand just to stay in, use more skilled stage, then you are a livestock “code”, someone can replace you at any time. Maybe some people will say that the project time is too tight to allow you to write a wheel, you write and those big guys write good? But WHAT I want to say is this: I didn’t say that you don’t have to write your own wheels, and your wheels don’t have to be compared to others, because the purpose of building a wheel is to understand the minds of those wheels.
Say so much actually want to tell you to learn framework to understand the underlying principles of the framework, to master is the most commonly used principles.
In recent years, with the continuous expansion of service system and the rapid growth of users, the traditional single application architecture has been unable to meet the needs of our system, especially with the rapid development of large-scale Internet system, a variety of flexible system architecture models emerge endlessly. Distributed processing is becoming more and more popular in the industry — computer systems are undergoing an unprecedented transformation from centralized to distributed architecture. At the same time, distribution has become an indispensable part of the Java programmer interview knowledge, especially for engineers who have been working for two to five years now, distribution is definitely not a plus technology.
Microservices Architecture
There is a lot of talk about how complex microservices architectures are and how they create distributed problems, but once we understand these problems and find solutions, there is a sense of cloud clearing. Microservice architectures are not perfect. There is no such thing as a perfect architecture. Microservice architectures evolve as businesses and teams grow. In the beginning, there may be several or a dozen micro-services, each of which is a separate library, and the service data can be merged and forwarded in parallel through the API Gateway. With the expansion of business, continue to join the search engine, caching technology, distributed message queue, data storage layer data replication, partition, sub-table and so on!
conclusion
No matter what technology you learn, you ultimately need to generalize, organize, and make what you learn your own. You’re building your own body of knowledge. Take notes and summarize as you study. Once the habit is formed, it will be imprinted in your mind over time. The next time you are asked this question, you can use what you have summarized before to answer it.
If you are interested in technical improvement, xiaobi.com provides an advanced architecture information based on the above map. Resource sharing includes but is not limited to (distributed architecture, high scalability, high performance, high concurrency, Jvm performance tuning, Spring, MyBatis, Nginx source code analysis, Netty, Kafka, Mysql, Zookeeper, Tomcat, Docker, Dubbo, Nginx).
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