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Free Java tutorial

Learn Java, from first line to JVM internals

359 lessons across 26 worlds. Read them free here, or learn them interactively, with practice and memory reviews, in the Brewlearn app.

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Beginner Java ยท Intern โ†’ Junior

Never written a line of code? Start here.

Java Foundations

12 lessons

Variables & Types

16 lessons

Operators & Expressions

14 lessons

Control Flow

14 lessons

Methods

13 lessons

Arrays

12 lessons

Strings & Text

13 lessons

Intermediate Java ยท Junior โ†’ Mid

Know the basics? Master objects, collections, generics and streams.

Classes & Objects

14 lessons

Inheritance & Polymorphism

18 lessons

Interfaces & Abstraction

12 lessons

Enums, Records & Nested Types

13 lessons

Exceptions & Errors

15 lessons

Collections Framework

19 lessons

Generics

12 lessons

Lambdas & Functional Java

11 lessons

Streams API

17 lessons

Core APIs Toolbox

12 lessons

I/O, Files & Networking

12 lessons

Advanced Java ยท Senior โ†’ Java Architect

Go deep: concurrency, the JVM, modern Java and design patterns.

Concurrency Fundamentals

14 lessons

Advanced Concurrency

14 lessons

JVM Internals & Memory

16 lessons

Reflection, Annotations & Modules

12 lessons

Modern Java 17 โ†’ 25

10 lessons

Design Principles & Patterns

16 lessons

Data Structures & Algorithms

14 lessons

Testing, Tools & Ecosystem

14 lessons