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

64 Mentors

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

26,330 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 Jake Varness

Jake Varness GitHub Page

I've been writing Java code professionally during the entirety of my career, spanning many years and multiple software companies!
Avatar of Samuel Braun

Samuel Braun https://github.com/MindLabor

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 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.
Avatar of Daria Golub

Daria Golub Twitter

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

Alex Jablonski https://github.com/ajablonski

I work as a software developer for a tech consulting company. No matter what language I'm working in, there's always a soft spot in my heart for Java.
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
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.

Pythagorean Triplet
hard
lists
logic
math
integers
Phone Number
medium
conditionals
pattern matching
regular expressions
strings
Twelve Days
medium
arrays
conditionals
loops
strings
Leap
easy
booleans
integers
logic
Anagram
medium
arrays
conditionals
equality
lists
loops
strings
Zebra Puzzle
medium
logic
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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