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

49 Mentors

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

13,472 Students

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

104 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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A tremendous learning opportunity to explore the depth of your own knowledge

Exercism is fantastic in learning new languages but that is not the extent of it. If you are a "more experienced" programmer you may have encountered impostor syndrome: the idea you don't really know what you think you know. Exercism lets you solve problems and put them in the space of open feedback which is a tremendous learning opportunity to explore the depth of your own knowledge. Even if you have been programming in a language for awhile it is worth checking into Exercism to see where you stand with current implementation practices.

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 Abdul Wahab

Abdul Wahab https://github.com/arwahab

Software developer versed in Java & Spring Boot looking to teach others and also learn from them
Avatar of Crane Yuan

Crane Yuan Personal Blog Site

I am a backend developer. I've written code in Java professionally, as well as use it for open source contribution.
Avatar of Will Madison

Will Madison https://github.com/willmadison

Passionate developer. Live long learner. Father. Geek. Frat Boy :). I've written Java professionaly for many years and mentor/coach myriads of Java developers.
Avatar of Ivan Šarić

Ivan Šarić https://github.com/isaric

I am primarily a Java backend dev working full-time in the e-commerce field. Learning programming has changed my life for the better and I hope to help others do the same.
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 Karim DRIDI

Karim DRIDI My LinkedIn Profile

Passionate about coding since 1995.
Fun. Challenging. Interesting

Community-sourced Java exercises

These are a few of the 104 exercises on the Java track. You can see all the exercises here.

House

medium
arrays
conditionals
loops
strings
text formatting

Kindergarten Garden

medium
arrays
enumerations
lists
logic
loops
pattern recognition
strings

Nucleotide Count

medium
conditionals
exception handling
integers
maps
parsing
searching
strings

Forth

hard
exception handling
lists
logic
parsing
stacks
strings

Alphametics

medium
conditionals
logic

Largest Series Product

medium
integers
loops
strings
type conversion
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 Logan Stucki

Logan Stucki Sometimes I blog on my site

I'm a 17 year old student and code artisian. I love writing code and making things. Currently, I enjoy answering stackoverflow questions and making webapps when not contributing to exercism.
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 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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