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

74 Mentors

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

35,192 Students

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

113 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 Paulo Rosa

Paulo Rosa https://github.com/paulorosa

I've been programming in Java since 1998 and teaching since 2012.
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 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 Sushovan Karmakar

Sushovan Karmakar GitHub Profile

I am professional Java Developer who want to contribute in open source. I want to share my knowledge and experiences to help others to reach their goals
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 Sébastien NEDJAR

Sébastien NEDJAR https://github.com/nedseb

I'm an associate professor at Aix-Marseille University. I've written et taught Java and C/C++ professionally. I love learning new languages especially functional ones.
Fun. Challenging. Interesting

Community-sourced Java exercises

These are a few of the 113 exercises on the Java track. You can see all the exercises here.

Knapsack
medium
algorithms
arrays
conditionals
Scrabble Score
easy
games
loops
pattern matching
strings
transforming
Largest Series Product
medium
integers
loops
strings
type conversion
math
Minesweeper
medium
conditionals
games
integers
lists
matrices
strings
Atbash Cipher
medium
cryptography
security
strings
Micro Blog
easy
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 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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