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Join Exercism’s Java Track for access to 155 exercises grouped into 26 Java Concepts, with automatic analysis of your code and personal mentoring, all 100% free.
class Greeter { String getGreeting() { return "Hello, World!"; } }
Get better at programming through fun, rewarding coding exercises that test your understanding of concepts with Exercism.
Take a nested list and return a single list with all values except nil/null.
Given a DNA string, compute how many times each nucleotide occurs in the string.
Implement basic list operations.
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.
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".
Java programs perform automatic memory management for their lifecycles.
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.
Learn more about mentoring 
The Java track on Exercism has 26 concepts and 155 exercises to help you write better code.
See all Java exercises 
