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This article mainly explains "what technologies Java programmers should learn". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn what technologies Java programmers should learn.

1. DevOps (Docker and Jenkins)

Over the past year, more and more companies are transforming. DevOps,DevOps is huge and you need to learn a lot of tools and principles, but you don't have to worry about it. Some great gods have shared the DevOps roadmap (https://github.com/kamranahmedse/developer-roadmap), which you can follow to learn and master DevOps at your own speed.

If you are an experienced Java programmer who is willing to learn about environmental management, automation, and overall improvement, you can also become a DevOps engineer.

2. Java 9-Java 15

It is believed that the Java version mainly used by many Java developers is still Java 8, although Java 9-Java 13 has been available for some time.

But as Java programmers, we may not be able to actually upgrade JDK in an online environment for some reason, but it is necessary to take some time to learn the new features of Java 9, Java 10, Java 11, Java 12, and Java 13.

In addition, you can focus on some key features, such as GC-related features, features that change the coding style, etc. There is the LTS version of Java (Java 8, Java 11) to focus on learning.

I would also like to remind you that in 2020, Oracle will also launch Java 14 and Java 15 models! If you are using Java 7, you will soon be "trapped"!

3 、 Spring Framework 5

In 2017, we witnessed many major upgrades to the Spring and Java ecosystems, and Spring 5.0 is one of them. Spring 5's new reactive programming model, HTTP/2 support, and Spring's full support for functional programming through Kotlin are all worth taking a look at.

4 、 Spring Security 5.0

Spring Security 5. 0 provides many new features and supports Spring Framework 5. 0, with more than 400 enhancements and bug fixes. Before Spring Security 5.0.0, passwords were kept in clear text, which was very insecure. Because this is a large version, we decided to use a more secure way to store passwords. The main highlight of Spring Security 5.0.0 is that it only requires minimized JDK 8, reactive security features, OAuth 2.0 (OIDC), and modern password storage.

5 、 Spring Boot 2

Based on Spring 5 Framework, Spring Boot 2.0 provides features such as responsive Stream of asynchronous non-blocking IO, non-blocking functional Reactive Web framework Spring WebFlux and so on. Many people who have used SpringBoot know that building Web applications using SpringBoot is really fast and good, and I believe that SpringBoot 2 will bring more surprises.

6. Hadoop, Spark and Kafka

In addition, in 2020, Java programmers need to learn the relevant knowledge of big data. Especially the two frameworks of Apache Spark and Kafka.

If you also want to learn from big data in 2020, you can't get around the Hadoop ecology.

7 、 Elasticsearch

Full-text search is the most common requirement, and open source Elasticsearch (hereinafter referred to as Elastic) is the first choice of full-text search engine. Wikipedia, Stack Overflow, and Github are all using it.

Elasticsearch is a search engine based on Lucene library. It provides a distributed, multi-tenant full-text search engine with HTTP Web interface and schemaless JSON documents. Elasticsearch is developed in Java and released as open source software under the Apache license.

8 、 ServiceMesh

It has been very popular in the past two years, and the fire has been a mess. In 2019, but any programmer-related conference, if there is no topic on ServiceMest, it will be embarrassed to open.

Everyone is talking about ServiceMesh.

Few people know how to land ServiceMesh.

But everyone thinks that other people are working hard on ServiceMesh.

So everyone claims to be doing ServiceMesh.

This concept, which is called the next generation micro-service architecture, is now unknown to most people. Only know that a lot of big factories claim to be doing it, and many Daniel are preaching.

9 、 Serverless

Serverless computing (English: Serverless computing), also known as function as a service (Function-as-a-Service, abbreviated to FaaS), is a model of cloud computing. Based on platform as a Service (PaaS), serverless computing provides a micro architecture. End customers do not need to deploy, configure or manage server services. All server services needed to run the code are provided by the cloud platform. This thing sounds very high-end.

In 2019, like ServiceMesh, everyone claimed to be doing it. But a lot of people don't know what he is.

10 、 Kotlin

If you are concerned about the new features of Java 13, you must know that the function of string text block has been introduced, which is actually a reference to Kotlin. In addition, in recent years, Java has many features that learn from Kotlin, which is more concise than Java,Kotlin, and the code compiled by Kotlin can also be run directly through JVM.

Kotlin is a statically typed programming language that runs on the Java virtual machine and can also be compiled into JavaScript source code. Kotlin is designed to produce programs with high performance requirements, so it runs on a par with Java. Kotlin can be used as a plug-in from JetBrains InteilliJ Idea IDE as a development tool.

Thank you for your reading, the above is the content of "what technology Java programmers should learn". After the study of this article, I believe you have a deeper understanding of the technology that Java programmers should learn, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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