Java Learner

Learn Java with a curriculum, not a pile of tabs.

Start from the basics, move lesson by lesson, practice what you read, and keep the reference close when you need it.

Start the curriculum Open the reference

Guided curriculum

Follow the course in order and always know what lesson comes next.

Searchable reference

Jump to syntax, APIs, and examples when you need a fast refresher.

Hands-on practice

Use training pages and the browser compiler to test ideas while you learn.

Start here

The first modules are laid out for you.

View full roadmap →

Module 1

4 lessons

Module 1: Start Coding in Java

Run Java code first, understand how source becomes a program, install and verify JDK 25, then compile and debug a local Java file.

Open module First lesson

Module 2

5 lessons

Module 2: Output, Input, Variables, and Types

Learn how Java prints values, stores data in variables, reads input from the user, and converts between common types.

Open module First lesson

Module 3

5 lessons

Module 3: Operators, Expressions, and Strings

Use arithmetic, comparisons, logic, and string operations to build useful expressions before you move into decision-making.

Open module First lesson

Module 4

5 lessons

Module 4: Decision Making

Use booleans, conditions, `if` statements, and `switch` to make your programs choose the right path.

Open module First lesson

Keep studying

Everything you need is in the same app.

Lessons are for learning in order. The reference is for quick lookup. The compiler is for testing ideas. Practice pages help you move from reading to doing.

Practice exercises →Browser compiler →Regex tester →