Java

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Java is a very widely used Object Oriented programming language. It's safe, simple to use and portable so that you can "write once, run anywhere".
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Track mentors

52 Mentors

Our mentors are friendly, experienced Java developers who will help teach you new techniques and tricks.
Track students

15,609 Students

Join thousands of students who have enjoyed learning and improving their skills by taking this track.
Track exercises

104 Exercises

Hundreds of hours have gone into making these exercises fun, useful, and challenging to help you enjoy learning.

About Java

class Greeter {

    String getGreeting() {
        return "Hello, World!";
    }

}

Java is among the most popular available programming languages, thanks to its versatility and compatibility. It is widely used for software development, mobile applications and developing larger systems.

Java was born in 1995 and is maintained by Oracle. Despite the fact that it isn't as young as some of the fresh languages out there, Java is still really popular. It was designed to be fast, secure, reliable, beginner-friendly and highly portable. This portability perk exists because Java is executed on a cross-platform compatible Java Virtual Machine - JVM. Android apps are also developed using Java, since the Android Operating System runs on a Java language environment.

The Java community is huge! GitHub for example has over 1.5 million Java projects. It's also worth mentioning that Java has the second largest community in StackOverflow! This is important because the larger a programming language community is, the more support you'd be likely to get.

Java also has a powerful and well-designed set of built-in APIs - Application Programming Interfaces, which can be used for various activities like Database connection, networking, I/O, XML parsing, utilities, and much more.

From laptops to datacenters, game consoles to scientific supercomputers, cell phones to the Internet, Java is everywhere!

Join the Java track

Exercism is a great website

The reviews are incredibly helpful because they help me see things that I missed, learn about new ways and sometimes interesting discussions that can add a fun twist to maybe a simple problem.

Relaxed. Encouraging. Supportive.

Meet the Java Track mentors

Once you join the Java language track, you will receive support and feedback from our team of mentors. Here are the bios of a few of the mentors of this track.

Avatar of Dusan Rychnovsky

Dusan Rychnovsky https://github.com/dusan-rychnovsky

I have worked with Java for many years, both professionally and as a hobby.
Avatar of Will Madison

Will Madison https://github.com/willmadison

Passionate developer. Live long learner. Father. Geek. Frat Boy :). I've written Java professionaly for many years and mentor/coach myriads of Java developers.
Avatar of Jake Varness

Jake Varness GitHub Page

I've been writing Java code professionally during the entirety of my career, spanning many years and multiple software companies!
Avatar of Marcus Bergenlid

Marcus Bergenlid https://github.com/mbergenlid

I'm a software engineer working professionally in Java, I love to learn new languages and to improve my coding style. My side projects are usually focused around learning some new language or technology.
Avatar of Adarsh K Kumar

Adarsh K Kumar My Blog

I'm a Software Developer with exposure to Java/Spring, Devops, Linux, Databases. Currently exploring Distributed Systems and Erlang.
Avatar of Robin Victorino

Robin Victorino https://github.com/rvictorino

I've been working as a Java developer for a bit more than 5 years now. Finding elegant solutions is something I value. I'm an open source enthusiast.
Fun. Challenging. Interesting

Community-sourced Java exercises

These are a few of the 104 exercises on the Java track. You can see all the exercises here.

Zebra Puzzle
medium
logic
Matching Brackets
medium
stacks
strings
Space Age
easy
conditionals
floating point numbers
Diamond
medium
arrays
lists
loops
strings
text formatting
Circular Buffer
hard
classes
exception handling
queues
Word Count
medium
conditionals
integers
loops
maps
strings
Passionate. Knowledgeable. Creative.

Meet the Java Track maintainers

The Java Maintainers are the brains behind the Java Track. They spend their spare time creating interesting and challenging exercises that we can all learn from. We are incredibly grateful for their hard work. Here are the bios of a few of the maintainers of this track.

Avatar of Logan Stucki

Logan Stucki Sometimes I blog on my site

I'm a 17 year old student and code artisian. I love writing code and making things. Currently, I enjoy answering stackoverflow questions and making webapps when not contributing to exercism.
Avatar of Sam Warner

Sam Warner

I am a software developer and consultant working for Black Pepper Software, a software company based in Leamington Spa, England. I'm a recent Computer Science graduate from the University of Warwick, and love all things to do with computers!
Avatar of Frida Johanne Tveit

Frida Johanne Tveit

I'm a software developer working for Softwire, a UK based software company. I'm a full stack developer working with many different languages including Java. I love programming and helping other people learn more about it!

Get started with the Java track. As with everything on Exercism, it's 100% free!

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