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

42 Mentors

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

9,386 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

What I like about it is that I am able to solve the challenges in a TDD way working in a environment that I am familiar (my own PC not a browser IDE) and the cherry on the top of the cake is that I have access to code reviews.

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 Monica Calderaro

Monica Calderaro https://github.com/mccr

I'm a career changer (used to be a telecommunication Engineer), always up for learning new things and helping along the way.
Avatar of Adrian Spanu

Adrian Spanu https://github.com/aspanu

I work as a software engineer full time. I've been working in Java codebases for a number of years now and I really like the flexibility and usefulness of Java. I'm happy to help new coders discover the awesomeness of Java. Yes, it does exist :).
Avatar of Rahmeen Habib

Rahmeen Habib https://github.com/Rahmeen14

I write C++ at the university, have 10 week professional experience with Java in an intern project and am an RGSoC scholar for a JavaScript Project
Avatar of Florian Zeidler

Florian Zeidler https://github.com/das-vinculum

I am software engineer from Berlin, Germany. I work since 2013, often in legacy environments and mostly in Java.
Avatar of Paul Moore

Paul Moore https://github.com/pdmoore

I've been programming in Java and JUnit for almost as long as they've existed. I really appreciate the ability to effortlessly refactor code using these tools.
Avatar of Richard Wild

Richard Wild https://github.com/richardjwild

I'm a Software Craftsman at Codurance, doing software development professionally for over 20 years.
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.

Zebra Puzzle
medium
logic
Queen Attack
medium
arrays
classes
conditionals
games
matrices
Pig Latin
medium
arrays
lists
strings
transforming
List Ops
hard
filtering
functional programming
generics
lists
loops
Perfect Numbers
easy
enumerations
exception handling
filtering
integers
math
Sieve
medium
algorithms
integers
lists
loops
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 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!
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 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!

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

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