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Java Tutorial is a programming language and computing platform, which was released by Sun
Microsystems in 1995. Java is fast, easy, secure, reliable, low cost, distributive, multithreaded, robust
etc. There are numerous applications and websites that will not work, if you haven’t installed java. From
laptops to mobiles, game consoles to scientific supercomputers, web applications to robotics, Java is
Most of the people think where exactly Java is used? They don’t see many games written in Java except
Minecrfat. In fact, tools like Adobe Acrobat, Microsoft office are also not written in Java. Well, that’s
completely okay, but you can get to know about Java by installing it at your desktop. It is said more than
3 billion devices run Java, which is quite a huge number.
Let’s have a look where Java is used in real world and how it is useful to us.
Mobile is eating the world today. Open any application in your Android phone, they are actually written
in Java programming language, with Google’s Android API, which is similar to JDK. Today, many Java
programmers are Android app developers. But beware: Android is little different from the rest of the
An application that runs on the server side and creates dynamic page, is called we application. Java is
also big on E commerce and web applications. Struts 2.0, servlet, jsp, struts, jsf are used for creating web
applications in Java. Many of the government, healthcare, insurance, education, defense and several
other departments have their web applications built in Java.
Many useful software and development tools are written and developed in Java like Eclipse, InetelliJ,
Gradle, YourKit, Clover, Mockito, Jetty, Hibernate, VisualVM, JUnit, Jenkins, Spring Boot, Guice, Guava,
FindBugs, Jackson, Snappy and JD-GUI. Each of these tools has its merits, but there are few that stand
out from the crowd due to their popularity, versatility and usefulness. You can’t do the job right without
the right tools. From code building to bug squashing, learning these tools can help you make your Java
code and become a more efficient Java developer.
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.
Banks have huge Java estates, generally speaking, that they can’t get rid of.
High Frequency Trading Space
If you have a typical Java programmer and typical C++ programmer, both of them having an experience
of two years, having a same amount of time for writing a typical object oriented program. The Java
programmer will complete the work earlier and will have more time to tweak the application as
compared to C++ programmer. Java platform has improved its performance characteristics a lot and
with modern JITs, its capable of delivering performance at C++ level.
Java is extremely useful and given its heavy usage in financial services industry, Investment banks and E-
Commerce web application space. Anyone who is learning has bright future. Nowadays, even colleges
and schools have started teaching Java for the better future of students.