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About Java

class Greeter {

    String getGreeting() {
        return "Hello, World!";


147 coding exercises for Java on Exercism. From Clock to Difference of Squares.

Get better at programming through fun, rewarding coding exercises that test your understanding of concepts with Exercism.

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Key Features of Java



Java is a modern, fast-evolving language with releases every 6 months.


Every expression has a type known at compile time.


Java is primarily an object-oriented language, but has many functional features introduced in v1.8.

General purpose

Java is used for a variety of workloads like web, cloud, mobile and game applications.


Java was designed to be cross-platform with the slogan "Write once, run anywhere".

Garbage Collection

Java programs perform automatic memory management for their lifecycles.

A taste of the concepts you'll cover

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Get mentored the Java way

Every language has its own way of doing things. Java is no different. Our mentors will help you learn to think like a Java developer and how to write idiomatic code in Java. Once you've solved an exercise, submit it to our volunteer team, and they'll give you hints, ideas, and feedback on how to make it feel more like what you'd normally see in Java - they'll help you discover the things you don't know that you don't know.

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Community-sourced Java exercises

The Java track on Exercism has 25 concepts and 147 exercises to help you write better code. Discover new exercises as you progress and get engrossed in learning new concepts and improving the way you currently write.

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