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

64 Mentors

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

26,310 Students

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

109 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 Andrea Gazzarini

Andrea Gazzarini LinkedIn Profile

Curious software engineer with more than 15 years of experience, mainly focused on the Java language and IR/Search technologies.
Avatar of Shankar Shastri

Shankar Shastri GitHub Profile

Lover Of Pure Functional Programming.
Avatar of Uzi Landsmann

Uzi Landsmann https://github.com/uzilan

I have been a developer for about 15 years, working daily with Java. I love learning new languages and am trying to learn and adopt a functional programming style.
Avatar of Nordwin Hoff

Nordwin Hoff Twitter

I am developper working with java and javascript every day. I love to learn new things and share it with people around me. I believe in team work, well designed code and simple things to make coding a fun experience.
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 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!
Fun. Challenging. Interesting

Community-sourced Java exercises

These are a few of the 109 exercises on the Java track. You can see all the exercises here.

Gigasecond
easy
dates
integers
time
Hello World
easy
strings
Space Age
easy
conditionals
floating point numbers
Bob
medium
booleans
conditionals
strings
Error Handling
medium
exception handling
optional values
Rectangles
hard
arrays
logic
pattern recognition
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 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 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.

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

Join the Java Track