What are the application scopes of Java?

In the era of rapid development of IT, many people enter the Internet industry and choose to be a Java programmer. If you are a beginner or just starting to learn Java, you may be thinking about where exactly Java is used?

Website Application

Java is also widely used in e-commerce and website development. There are many RESTfull architectures you can use, which are developed using Spring MVC, Struts 2.0 and similar frameworks. Even simple Servlets, JSP and Struts are popular in various government projects. Many websites in government, medical, insurance, education, national defense and other departments are built on Java. By studying Java training in Zhengzhou Danai, you can easily build various websites and become a technical powerhouse.

Software Tools

Many useful software and development tools are written and developed using Java, such as Ecilpse, InetelliJIdea and NetbansIDE. I think these are the most commonly used desktop applications written in Java.

As mentioned above, Swing was once very popular in client-side development of graphical user interfaces. Most of them were used in the financial services field and investment banks. Although JavaFx is gradually becoming popular, it still cannot replace Swing, and C# has replaced Swing in most financial fields.

Android APP

If you want to know where Java applications are located, you are not far from the answer. Open your Android phone or any App. They are completely written in the Java programming language with Google Android API. This API is very similar to JDK. A few years ago, Android just started to take off, but today, many Java programmers are Android App developers.

Server applications in the financial services industry

java has great applications in the financial services industry. Many global investment banks such as Goldman Sachs, Citigroup, Barclays, Standard Charted and some other banks use Java to write front-end and back-end electronic trading systems, settlement , information confirmation system, data processing projects and other projects.

Java is used to write server-side applications, but most of them do not have a front-end. They receive data from a server (upper level), process the data and send it to other processing systems (lower level). JavaSwing is popular because it can develop graphical user interface clients for traders to use, but now C# is rapidly replacing Swing's market, which puts Swing under pressure.

Trading system

Third-party trading systems, a large part of the financial services industry, are also written in Java. For example, popular trading systems like Murex, which is used to interface with many bank front-ends, are also written in Java.

J2MEApps

Although the arrival of IOS and Android has almost killed the J2ME market, there are still many low-end Nokia and Samsung mobile phones using J2ME. There was a time when most games and mobile applications were written using MIDP and CLDC, or some J2ME platforms to adapt to the Android system. .J2ME is still popular in Blu-ray, magnetic cards, set-top boxes and other products. The reason why apps are so popular is because for all Nokia phones, apps still work with J2ME.

Embedded field

Java also has great applications in the embedded field. You only need 130KB to use Java technology (on a small chip or sensor), which shows how reliable this platform is. Java was originally designed for embedded devices. In fact, this was part of Java's original "write now, run anywhere" mission.

Big Data Technology

Hadoop and other big data technologies also use Java to varying degrees, such as Apache's java-based Hbase, Accumulo (open source), and ElasticSearch. But Java has not occupied the entire field. There are other big data technologies such as MongoDB that are written in C. If Hadoopor and ElasticSearch gradually develop, then Java has the potential to gain greater development space in the field of big data technology.

High-frequency trading field

The Java platform has greatly improved performance features and JITS, and Java also has C-level transmission performance. Therefore, Java is also popular for writing high-concurrency systems. Although Java's transmission performance is no better than C, you don't need to consider Java's security, portability, maintainability and other issues (Java has already been implemented internally), and Java has a faster running speed. Issues such as security can make an application written by an inexperienced C programmer slower and less reliable.

Scientific Applications

Java is now often the default choice for scientific applications, including natural language processing. The main reason for this is that Java is more secure, portable and maintainable than C or other languages, and Java has better advanced concurrency tools.

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