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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

44,875 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

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 Kaushik Chatterjee

Kaushik Chatterjee LinkedIn

I am a 16-year old software developer and tech enthusiast who loves coding and researching exponential technologies.
Avatar of Paul Aly

Paul Aly https://github.com/maly7

I've been developing in Java Professionaly for 5 years now. I'm passionate about writing clean code and learning new programming languages.
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 Cameron MacDonald

Cameron MacDonald GitLab

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

Dennis Hartrampf https://github.com/DennisHartrampf

I have 7+ years experience as software developer, mainly using Java, recently also Kotlin ♥. I'm a fast learner and eager to explore new technologies. I'm also a believer in agile software development, team work and Clean Code.
Avatar of Aaditya Kulkarni

Aaditya Kulkarni https://github.com/aadityakulkarni

I am a Full stack web developer. I've written code in Java professionally, as well as use it for open source contribution.
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.

Book Store
hard
algorithms
floating point numbers
integers
lists
Gigasecond
easy
dates
integers
time
Robot Name
medium
pattern matching
randomness
regular expressions
strings
text formatting
Collatz Conjecture
medium
conditionals
exception handling
integers
recursion
math
Hangman
hard
strings
reactive programming
functional programming
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 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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