Why learn Java programming? Is Java programming good?

Why learn Java programming? Is Java programming good? Java is a programming language that generates software for multiple platforms. When programmers write Java applications, the compiled code (called bytecode) can run on most operating systems (OS), including Windows, Linux and MacOS. Java derives most grammars from C and C++ programming languages. Let's introduce Java programming in detail.

First, why should we learn Java programming? Is Java programming good? Java has a perfect ecosystem.

In the past ten years or so, Java has been the most widely used language in the world every year. Millions of IT companies around the world have built a huge Java ecosystem, and a lot of software is developed based on Java. Java is also called "English in the computer world". The application scope of JAVA involves all industries and most IT enterprises, forming a huge ecological circle.

The core ideas of Java are: object-oriented programming, inheritance, high compatibility (strong code portability), open source, and avoiding repeated wheel making (using technologies such as Mybatis, Spring, Redis, etc.). You only need to add the dependency of jar package to the project, and jar package is the core code of technology. These frameworks are developed by professional technical teams, which saves a lot of energy for most project development and can be used at any time).

This era is not only a great opportunity for the industry, but also an opportunity for the development of Java. Although there has been opposition from Java, it has not stopped Java from moving forward. On the contrary, it will provide a direction for the development of Java. We have reason to believe that even after 20 years, Java will not be defeated.

Second, why should we learn Java programming? Is Java programming good? Good Employment and Development Prospects of Java

According to IDC's statistics, among all the needs of software development talents, the demand for JAVA engineers accounts for 60%~70% of the total demand. At the same time, the salary of JAVA engineers is relatively high. Generally speaking, it is normal for an engineer with 3 to 5 years of development experience to earn an annual salary of 6,543,800 yuan.

With the continuous improvement of Java, under the double guarantee of Java task control suite and Java advanced management console, Java has entered a new era of use, and cloud computing and Internet of Things have also entered this era.

As the most commonly used underlying development language for cloud computing, the security, openness, stability and cross-platform of Java complement the advantages of high reliability and high scalability of cloud computing.

Therefore, even if something really happens, Java is a very good bedding language. Because of the programming idea, the design module will not be eliminated! Java's ecosystem determines that it will be one of the most popular languages in the future 10 or even 20 years. And to take a step back, even if Java is on the verge of elimination, when you are proficient in Java, you can learn other languages by analogy.

The demand for JAVA engineers will continue to increase in the next few years. Due to the shortage of talents, the salary of this major is good compared with other majors. The salary of a Java engineer is directly related to your work experience. When you have rich experience, you will be very popular in this society, and the wages paid by enterprises are quite high. Only you can choose them.

Third, why should we learn Java programming? Is Java programming good? Comparison between Java language and other development languages

Great gods from all walks of life criticize Java as a language with strong typology and strict grammatical structure, but for beginners, Java is still very friendly, and the relatively simple learning cycle will not be too long. Many people feel very relaxed after learning Java. It is a very good bedding language.

In the list of TIOBE programming languages, Java has been ranked first for a long time, and it is the best programming language in 20 15. Through GoogleTrends, we can see that the search volume of Java is much higher than that of the following languages.

Java realizes the characteristics of "write once and run everywhere" through JVM, which shields the differences between different platforms and creates bytecode language as the "assembly language" of Java code, which reads bytecode files and parses them to run;

The JVM provides a garbage collector. In most cases, programmers don't need to worry about memory allocation and recycling.

Java has a killer framework in the enterprise development field, which makes Java invincible in the enterprise service field;

Java has a killer application scenario in the field of client development-Android development;

The ecology of Java development is very rich and complete, and there are countless mature and reliable open source software;

Java is an object-oriented static typing language, and its object-oriented characteristics help Java to build large-scale and complex applications. Static typed language makes Java run much faster than interpreted language, and at the same time makes Java applications find many problems during compilation, which is type-safe.

JVM virtual machine: according to the concept of virtualization, JVM virtual machine belongs to host virtual machine. As a virtual machine, the core modules are: runtime memory management, class loading, bytecode system, execution engine, garbage collector and so on.

JRE(Java Runtime Environment): Only JVM is too difficult for ordinary Java developers, so Hotspot developers also provide corresponding JavaSEAPI and class libraries needed by other developers. These APIs, class libraries and JVM together constitute the Java runtime environment.

Java language: On the JVM, not only the Java language is enduring, but also a rich language ecology is cultivated, such as Scala, Groovy, Kotlin and other new generation languages.

JDK:JVM and JRE, as well as auxiliary tools and Java language constitute JDK.

Fourth, why learn Java programming? Is Java programming good? Java language development and application scenarios

More than 80% of high-end enterprise applications use JAVA platform (telecommunications, banking, etc. ). JAVA is a mature product with a history of 10. Amazon, Google, Yi Bei, Taobao, JD.COM, Ali and other large e-commerce brands are using Java for background processing. Therefore, many enterprises favor Java, mainly because Java has good scalability and can handle more customer data.

From the application scenarios and ecology of Java language, it can be divided into the following points:

Enterprise development (J2EE):SSM framework, SpringBoot, SpringCloud, JPA, caching, batch processing, task planning, etc.

Client development (J2ME):Android development

Big data development: Spark, Hadoop, HBase, ElasticSearch, etc.

Microservice is a new software architecture, which splits a large single application and service into dozens of supporting microservices. Micro-service strategy can make work easier. It can extend individual components instead of the entire application stack to meet service level agreements. Java technology has excellent universality, high efficiency, platform portability and security.

There is no necessary connection between microservice and language. The advantage of microservice is that it can bring heterogeneity to microservice, and qualified microservice can be written in all languages. There is no best language, only the most suitable usage scenario.

In my opinion, the most important concern of microservices is not development, nor operation and maintenance, but how to design microservices. Business design is far more important than code implementation. At this time, domain-driven design is so important. First, start with the domain model, design reasonable services, and then talk about micro-services.

The landing of micro-service needs to consider many issues such as service realization, how to develop and test, service operation and maintenance, portability and high availability.

After entering the landing link of micro-service, it will be related to language. For example, how to test microservices? The service provider of micro-service needs to call itself gracefully, while the service consumer needs to simulate the response of the provider.

A complete ecological environment can help you quickly put micro-services on the ground.

JAVAEE dominates a wide range of fields, mainly used in large enterprise applications, such as large enterprise management systems. The most typical are:

Large enterprises related to communication and network: China Mobile, China Unicom, China Telecom and China Netcom, whose main information is Java；;

Large enterprises related to financial banks, all banks and securities companies, such as China Industrial and Commercial Bank and China Construction Bank; Large-scale management systems, such as supply chain and customer management system;

E-government mainly uses JAVAEE, and most information systems of relevant government departments are developed in JAVA.

Games, many mobile games are developed in Java;

Embedded devices and consumer electronics products mainly use the popular Android. Wireless handheld devices, communication terminals, medical equipment, information appliances (such as digital TV, set-top boxes, refrigerators) and automotive electronic equipment are the hot application fields of Java.

Java is a good choice in terms of application, salary of future employment and scope of work, which may be the reason why so many people like Java and want to learn Java and become Java development engineers.