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If you are a beginner and just started learning Java, you might be thinking where exactly Java is used? You don't see many games written in Java except Minecraft, desktop tools like Adobe Acrobat, Microsoft Office are not written in Java, neither is your operating systems like Linux or Windows, so where exactly people use Java? Does it have any real-world application or not? Well, you are not alone, many programmers ask this question before starting with Java, or after picking Java is one of the programming language of choice at graduate level. By the way, you can get a clue of where Java is used by installing Java at your desktop, Oracle says more than 3 billion devices run Java, that's huge number, isn't it? Most major companies use Java in one way or other. Many server side applications are written in Java to process tens of millions of requests per day, high frequency trading applications are also written in Java e.g. LMAX trading applications, which is built over their path breaking inter-thread communication library, Disruptor. In this article, we will see more precisely, what kind of projects are done in Java, which domain or sector Java is dominating and where exactly Java is useful in real-world?
Real World Java Applications
There are many places where Java is used in real world, starting from commercial e-commerce website to android apps, from scientific application to financial applications like electronic trading systems, from games like Minecraft to desktop applications like Eclipse, Netbeans and IntelliJ, from open source library to J2ME apps etc. Let's see each of them in more detail.
1) Android Apps
If you want to see where Java is used, you are not too far away. Open your Android phone and any app, they are actually written in Java programming language, with Google's Android API, which is similar to JDK. Couple of years back Android has provided much needed boost and today many Java programmer are Android App developer. By the way android uses different JVM and different packaging, as we have seen in our previous article about how Android app works, but code is still written in Java.
2) Server Apps at Financial Services Industry
Java is very big in Financial Services. Lots of global Investment banks like Goldman Sachs, Citigroup, Barclays, Standard Charted and other banks use Java for writing front and back office electronic trading system, writing settlement and confirmation systems, data processing projects and several others. Java is mostly used to write server side application, mostly without any front end, which receives data form one server (upstream), process it and sends it other process (downstream). Java Swing was also popular for creating thick client GUIs for traders, but now C# is quickly gaining market share on that space and Swing is out of its breath.
3) Java Web applications
Java is also big on E commerce and web application space. You have a lot of RESTfull services being created using Spring MVC, Struts 2.0 and similar frameworks. Even simple Servlet, JSP and Struts based web applications are quite popular on various government projects. Many of government, healthcare, insurance, education, defense and several other department have their web application built in Java.
4) Software Tools
Many useful software and development tools are written and developed in Java e.g. Eclipse, InetelliJ Idea and Netbans IDE. I think they are also most used desktop applications written in Java. Though there was time when Swing was very popular to write thick client, mostly in financial service sector and Investment banks. Now days, Java FX is gaining popularity but still it is not a replacement of Swing and C# has almost replaced Swing in Finance domain.
5) Trading Application
Third party trading application, which is also part of bigger financial services industry, also use Java. Popular trading application like Murex, which is used in many banks for front to bank
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