Where is Java used in the real world?
If you are a beginner of Java programming, can you think where Java is actually used? You don't see many games written in Java, except Minecraft, desktop tools like Adobe Acrobat, Microsoft Office are not written in Java, so are operating systems like Linux or Windows, so Java is exactly used. Where to use? Does it have any application in the real world? Well, you are not the only one who asks, many programmers have asked this question before starting with Java, or after choosing Java as one of the programming languages in the university.
Anyway, you already have a clue where Java is used when installing Java to your desktop, Oracle says there are more than 3 billion devices running Java, which is a very big number right? ? Most large companies use Java in one way or another. Many server-side applications are written in Java to handle tens of millions of requests per day, stock trading applications are also written in Java, for example the LMAX application is built on the Disruptor library. In this article, we will see more precisely, what types of projects are written in Java, which dominate in the industry or field and exactly where Java is used in practice?
Real-world Java applications
Java is used in many places in the real world, from e-commerce websites to Android applications, from scientific applications to financial applications such as electronic trading systems, from gaming games. like Minecraft to desktop applications like Eclipse, Netbeans and IntelliJ, from open source libraries to J2ME applications, etc. Let's take a closer look!
1. Android applications
If you want to see where Java is used, you don't have to go far. Open your Android phone with any application, they are written in the Java programming language, with Google's Android API, which is similar to the JDK. In the last few years Android has grown very fast and many Java programmers have become Android application developers. Android uses JVM virtual machines and other packages, but the code is still written in Java.
2. Application server for financial services
Java plays a huge role in financial services. Many global investment banks such as Goldman Sachs, Citigroup, Barclays, Standard Charted and other banks use Java to write electronic transaction systems, validation and audit systems, processing projects. data and some other important jobs. Java is mainly used to write server-side applications, almost without any front-end, it receives data from an upstream server, processes it and sends data to a process. different (downstream). Java Swing is also commonly used to create user interface sections.
3. Java web applications
Java is also widely used in web applications and e-commerce. You have a lot of RESTfull services created using Spring MVC, Struts 2.0 and similar frameworks. Even simple web applications based on Servlet, JSP and Struts are also quite popular in government projects. Many government, health, insurance, education, defense and some other organizations have web applications built in Java.
4. Software tools
Many useful development tools and software are written in Java, for example: Eclipse, InetelliJ Idea and Netbans IDE. I think they are also the most commonly used desktop applications in Java. Despite the times Swing has been very popular, mainly in the field of banking and financial investment services. But now, Java FX is quite popular but still cannot replace Swing.
5. Commercial applications
Third party commercial applications, which make up a large part of the financial services industry, also use Java. Famous commercial applications such as Murex, used in many banks to connect from the inside out, are also written in Java.
6. J2ME applications
Although the advent of iOS and Android almost killed the J2ME market, it is still a big market for Nokia's low-end phones and Samsung using J2ME. At one point when almost all games and applications on Android were written in MIDP and CLDC, part of the J2ME platform. J2ME is still popular on products like Blu-ray discs, Cards, Set top boxes, etc. One of the reasons WhatsApp is popular is because it is also available on J2ME for all handheld devices. Nokia's which is still quite large.
7. Embedded space
Java is also heavily used in embedded fields (embedded). It shows the capabilities of this platform, you only need 130 KB to be able to use Java technology (on a smart card or sensor). Initially Java was designed for embedded devices. In fact, this is part of the original Java campaign "write once, run everywhere" and it seems to be bringing great benefits.
8. Big Data technologies
Hadoop and other big data technologies are also using Java in one way or another, for example: HBase, Accumulo (open source) and ElasticSearch of Java-based Apache. Although Java is not dominant in this area, there are technologies like MongoDB written in C ++. But Java has the potential to gain a bigger market share in this area if Hadoop or ElasticSearch gets bigger.
9. In the field of securities trading
The Java platform has greatly improved performance with modern JITs, it is capable of achieving performance comparable to C ++. For this reason, Java is also very popularly used to write high-performance systems, because although performance is slightly less than native language, you have the flexibility, flexibility, and faster maintenance.
10. Scientific applications
Currently Java is often a default choice for scientific applications, including natural language processing. The main reason for this is because Java is more secure, portable, easy to maintain, and comes with better tools than C ++ or any other language.
In the 1990s Java played a big role on the Internet thanks to Applet, but over the years, Applets have lost popularity, mainly due to various security issues on Applet's sand box model. Java is the default language in the software development industry, and is widely used in the financial services, banking and e-commerce industries. Java 8 has strengthened the belief that Java will continue to dominate the software development sector for years to come.
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