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

68 Mentors

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

29,733 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

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 Cameron MacDonald

Cameron MacDonald GitLab

Java was my second language and I wrote it professionally as well for a recommender system.
Avatar of Henri Lay

Henri Lay GitHub Profile

Interested in Craftsmanship and functional programming ;)
Avatar of Jônatas Barbosa

Jônatas Barbosa https://github.com/jonatascb

Java is one of my favorite languages. It's very powerful and versatile. Besides, you can build once and run everywhere! :)
Avatar of Paulo Rosa

Paulo Rosa https://github.com/paulorosa

I've been programming in Java since 1998 and teaching since 2012.
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 Daria Golub

Daria Golub Twitter

I am a software developer, with the main focus on Java. Clean code, proper tests, best practices ♥.
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.

Forth
hard
exception handling
lists
logic
parsing
stacks
strings
Word Count
medium
conditionals
integers
loops
maps
strings
Perfect Numbers
easy
enumerations
exception handling
filtering
integers
math
Raindrops
easy
conditionals
integers
strings
Phone Number
medium
conditionals
pattern matching
regular expressions
strings
Clock
medium
equality
integers
logic
object oriented programming
strings
time
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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