Exercism v3 launches on Sept 1st 2021. Learn more! 🚀🚀🚀

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

52,164 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!

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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 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 Samuel Braun

Samuel Braun

My first programming language was Java. At the beginning it was quite challenging to write some code that does actually make sense. After a few days however, it became easier and fun to mess around with.
Avatar of Alejandro Diaz

Alejandro Diaz Blog

I started work as a data analyst in 2017, doing typical excel stuff. I slowly discovered programming and am now entering my Master's in CS.
Avatar of Juan D. Vega

Juan D. Vega Blog

I love Java and I think it is getting better year after year. I think it takes advantage of the JVM and also has large community with a lot of amazing tools.
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 Troyan Krumov

Troyan Krumov https://github.com/LoadingBG

I love java and I love teaching people how to become fluent in this wonderful language.
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.

Darts
easy
games
Grade School
medium
conditionals
lists
maps
sorting
strings
Sum Of Multiples
medium
arrays
conditionals
integers
loops
math
Simple Linked List
medium
algorithms
exception handling
generics
lists
Secret Handshake
easy
bitwise operations
conditionals
cryptography
enumerations
integers
loops
transforming
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!

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