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

40 Mentors

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

8,501 Students

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

101 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 Adarsh K Kumar

Adarsh K Kumar My Blog

I'm a Software Developer with exposure to Java/Spring, Devops, Linux, Databases. Currently exploring Distributed Systems and Erlang.
Avatar of Marcus Bergenlid

Marcus Bergenlid https://github.com/mbergenlid

I'm a software engineer working professionally in Java, I love to learn new languages and to improve my coding style. My side projects are usually focused around learning some new language or technology.
Avatar of Shankar Shastri

Shankar Shastri GitHub Profile

Lover Of Pure Functional Programming.
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 Monica Calderaro

Monica Calderaro https://github.com/mccr

I'm a career changer (used to be a telecommunication Engineer), always up for learning new things and helping along the way.
Avatar of Koen Wellens

Koen Wellens My blog where I review books.

I've been working with Java for about 10 years now. I think I've come at a level where I can help others.
Fun. Challenging. Interesting

Community-sourced Java exercises

These are a few of the 101 exercises on the Java track. You can see all the exercises here.

Luhn
medium
algorithms
booleans
loops
strings
type conversion
Circular Buffer
hard
classes
exception handling
queues
Space Age
easy
conditionals
floating point numbers
Bowling
medium
conditionals
exception handling
games
integers
Transpose
medium
arrays
lists
loops
matrices
strings
text formatting
Rotational Cipher
medium
cryptography
integers
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 Frida Johanne Tveit

Frida Johanne Tveit

I'm a software developer working for Softwire, a UK based software company. I'm a full stack developer working with many different languages including Java. I love programming and helping other people learn more about it!
Avatar of Logan Stucki

Logan Stucki

I'm a 16 year old high school student. I like programming and java a lot. Contributing to exercism helps me to keep learning and get valuable experience. One day near, I hope to have a job or internship programming

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

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