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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

75 Mentors

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

38,417 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 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 Maykell Sánchez Romero

Maykell Sánchez Romero kellsaro

I enjoy learning and teaching programming languages. Web development enthusiast.
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 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 Eduard Maura

Eduard Maura https://github.com/mapu77

I've worked in Java since I started coding seriously for living and having fun :sparkles:
Avatar of Jônatas Barbosa

Jônatas Barbosa https://github.com/jonatascb

Java is one of my favorite languages. It's very powerful and versatile. Besides, you can build once and run everywhere! :)
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.

Sieve
medium
algorithms
integers
lists
loops
math
Perfect Numbers
easy
enumerations
exception handling
filtering
integers
math
Largest Series Product
medium
integers
loops
strings
type conversion
math
Dominoes
medium
algorithms
exception handling
games
lists
Secret Handshake
easy
bitwise operations
conditionals
cryptography
enumerations
integers
loops
transforming
Acronym
easy
loops
parsing
searching
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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