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

76 Mentors

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

49,856 Students

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

114 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

Exercism is a great website where I was able to have some very interesting challenges.

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 Jose 'Joshi' Raez

Jose 'Joshi' Raez https://github.com/joshiraez

I'm a polyglot developer who has worked in Java for the past 3 years. I'm always keen on learning new things, and I always try to share everything I discover both online or in talks.
Avatar of Maksim Danilau

Maksim Danilau https://github.com/MaksimDanilau

I like clear and laconic code
Avatar of Zuzanna Kru

Zuzanna Kru https://github.com/zuzia-kru

I have been working with Java professionally for almost 4 years now and I'm particularly passionate about the functional style features of it like the Stream API.
Avatar of Peter Lamby

Peter Lamby https://github.com/Serranya

I am an professional Java Developer who takes great interest in open source, teaching and self improvement. I'm hoping to help new Developers achieve their goals.
Avatar of Daniel Krauskopf

Daniel Krauskopf https://github.com/danruff5

I graduated from Fanshawe College with two programming degrees. I am currently a full-time employee for a large company using Java and many other technologies.
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.
Fun. Challenging. Interesting

Community-sourced Java exercises

These are a few of the 114 exercises on the Java track. You can see all the exercises here.

Poker
medium
games
parsing
sorting
Grade School
medium
conditionals
lists
maps
sorting
strings
Parallel Letter Frequency
medium
concurrency
maps
strings
Grep
medium
files
filtering
pattern matching
searching
strings
Simple Cipher
hard
cryptography
exception handling
randomness
security
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 Jason Runkle

Jason Runkle

I have been writing Java code professionally for the past 3 years and I have had a wonderful experience with it. The functional style of Java 8 took some getting used to, but it really improved my team's codebase and productivity.
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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