Java

Join the Java Track
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".
Join the Java Track
Track mentors

44 Mentors

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

10,316 Students

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

102 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 Koen Wellens

Koen Wellens My blog where I review books.

I've been working with Java for about 10 years now. I think I've come at a level where I can help others.
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.
Avatar of Fredrik Rubensson

Fredrik Rubensson https://github.com/froderik

So Java would be my main language with something like 15+ years of experience. I don't particularly like it but it is what I know best!
Avatar of Patrick Trottier

Patrick Trottier https://github.com/PTrottier

I am studying Computer Science in Canada. My passion for the Web as a platform for everyone and Open Source Software fuel my work on projects like Exercism.
Avatar of Carsten Dreesbach

Carsten Dreesbach https://github.com/HerbCSO

I've been using Java in my job for about 15 years now, but only became a full-time engineer about a year and a half ago (was in professional services doing customizations before that).
Avatar of Cameron MacDonald

Cameron MacDonald GitLab

Java was my second language and I wrote it professionally as well for a recommender system.
Fun. Challenging. Interesting

Community-sourced Java exercises

These are a few of the 102 exercises on the Java track. You can see all the exercises here.

Isogram
medium
conditionals
loops
parsing
strings
Secret Handshake
easy
bitwise operations
conditionals
cryptography
enumerations
integers
loops
transforming
Yacht
medium
enumerations
filtering
games
pattern matching
sorting
Poker
medium
games
parsing
sorting
Rectangles
hard
arrays
logic
pattern recognition
strings
Pascal's Triangle
medium
algorithms
arrays
exception handling
integers
matrices
math
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 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 Logan Stucki

Logan Stucki

I'm a 16 year old high school student. I like programming and java a lot. Contributing to exercism helps me to keep learning and get valuable experience. One day near, I hope to have a job or internship programming
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!

Join the Java Track