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This article introduces the relevant knowledge of "how to understand Java language". Many people will encounter such a dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

1. Overview

Over the years, Java has topped the list of popular programming languages, and many technology companies use Java to develop software and applications. Java is not only the preferred language for background development of Web system, but also a necessary development language for large Internet companies.

Java has the characteristics of object-oriented, distributed, robust, security, platform independence and portability (running on Java virtual machine), multithreading, dynamic and so on. It has good cross-platform ability and is a strongly typed language. Can write desktop applications, Web applications, distributed systems and embedded system applications, etc., is the favorite programming language of many programmers.

Java is also a language with strong encapsulation, which encapsulates almost all the commonly used functions, such as uploading and downloading of commonly used files, receiving and sending e-mail, JSON operation library, thread pool, database operation and so on. These functions are provided in the way of jar package, easy to use and good expansibility. Developers just need to assemble these functions according to their own business needs.

In addition to Java developers, testers who do interface tests and automated tests also use Java to write test scripts and test code using Java.

So after learning the Java language, you can work as a Web background development engineer, big data engineer, Android APP application development engineer, automation testing and interface testing engineer and other positions.

2. The technical system of Java

When we start to learn Java, we should start with the basics, including object-oriented features, basic data types, abstract classes, interfaces, GUI graphics programming, IO, network programming and other knowledge points. Among them, GUI graphics programming, mainly used for desktop application development, now few companies are using Java to develop desktop client programs, so only need a general understanding, do not need in-depth research.

After learning these basic knowledge points, we generally need to know about Html, CSS, JavaScript and other related knowledge used for Web front-end programming, as well as Jsp and Servlet for generating dynamic web pages.

Once you have mastered these knowledge points, you need to study the framework part of Java. The earliest framework used is SSH, or Struts+Spring+Hibernate, where Struts is used for process control, Spring for business flow, and Hibernate for database operations. At present, this framework is very old and basically out of use, but it is still necessary to understand the implementation ideas and core ideas of this framework.

Now the commonly used frameworks are SpringMvc and SpringBoot, which we must master. Once you have mastered the above basics and frameworks, you can basically easily deal with Java-related work.

After mastering the above technical points of Java system, we will use a lot of middleware technology in our daily development work. For example, application server JBoss, caching technology Memcached and Redis, load balancing Nginx, message queue RabbitMQ, Kafka, Dubbo, Zookeeper, non-relational database such as Mongodb, distributed framework Hadoop, application container engine Docker, big data computing engine Spark, cloud computing platform OpenStack, distributed file storage system Gluster and FreeNAS, project construction Maven, Gradle, code management Git, continuous integration Jenkins, etc. To master these technical points skillfully is the only way from junior engineer to intermediate engineer to senior engineer.

3. Java language and big data

Java is one of the most widely used programming languages at present, and many big data processing techniques and frameworks are written in Java. Distributed file system framework Hadoop, which is developed with Java, provides the ability to process massive data in a distributed environment. Hadoop has become the standard framework of big data.

HBase, a high-performance, column-oriented and scalable distributed storage system, is also developed with Java. Using HBase technology, large-scale structured data clusters can be built on cheap PC Server. Cassandra, an open source distributed database management system, and Elasticsearch, a distributed RESTful search engine built for the cloud, are also implemented using Java. So Java is big data engineer's favorite programming language. If you want to learn big data well, it is essential to master the foundation of Java.

4. IDE development environment of Java language.

(1) IntelliJ IDEA (the best Java development environment, recommended by five stars)

IntelliJIDEA is the most heavyweight IDE development tool produced by Czech JetBrains (founded by three talented Russian programmers in the Czech Republic). It is mainly used for Java development, integrates a wide range of common components, and can be used for Web and Android mobile application development.

IntelliJ IDEA is recognized as a good Java development tool in the industry, and it is a favorite and most respected IDE development tool for software developers, especially in intelligent code assistant, code automatic hint, refactoring, JavaEE support, various version tools (git, svn, etc.), JUnit, CVS integration, code analysis, innovative GUI design and other functions can be said to be extraordinary.

Its flagship version also supports HTML,CSS,PHP, MySQL,Python, and so on. The free version only supports a few languages such as Java.

Many colleagues who have used IntelliJ IDEA are deeply impressed by IDEA, saying that this is the development environment of the Java language that is easy to use.

(2) Android Studio

The development of APP applications running on Android generally uses Google's Android Studio development environment. Android Studio is an integrated development tool launched by Google for developing Android APP applications. It is also based on IntelliJ IDEA. Google has removed other features from the IntelliJ IDEA community version and added plug-ins that support Android development. It can be said that Android Studio is a weakened version of IntelliJ IDEA.

(3) Eclipse

IBM's Eclipse is a widely used free and open source Java editor and IDE. Eclipse's in-depth design of Java has a rich JavaEE integrated development environment, including complete coding, debugging, testing and release functions, and a complete package of HTML, Struts, JSP, CSS, Javascript, SQL,Hibernate,Spring and so on. It can improve the efficiency of Java development.

Eclipse has a good plug-in mechanism, supporting a variety of extensions and plug-ins, such as SpotBugs, Checkstyle and so on. In addition, Eclipse is also a cross-platform IDE that supports systems such as Windows, Linux and Mac OS X.

(4) MyEclipse

MyEclipse is a powerful enterprise integrated development environment developed on the basis of Eclipse and its own plug-ins, which is mainly used for the development of Java, Java EE and mobile applications. In the latest version of MyEclipse, there is also a wide range of support for CodeMix, especially for a variety of open source products and mainstream development frameworks. At present, it supports PHP, Python, Vue, Angular, React and other languages and framework development.

This is the end of "how to understand the Java language". Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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