Guided curriculum
Follow the course in order and always know what lesson comes next.
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.
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.
Module 1
6 lessonsModule 1: Start Coding in Java
Run Java code first, understand what the language is for, then install JDK 25 and run programs locally without getting buried in JVM internals.
Module 2
5 lessonsModule 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.
Module 3
5 lessonsModule 3: Operators, Expressions, and Strings
Use arithmetic, comparisons, logic, and string operations to build useful expressions before you move into decision-making.
Module 4
5 lessonsModule 4: Decision Making
Use booleans, conditions, `if` statements, and `switch` to make your programs choose the right path.
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.