Beginner Code District

Java

The enterprise workhorse, modernised.

Java has run banks, online stores and giant backends for three decades, and it was the first language of Android apps. Modern Java is far leaner than its reputation. This course starts from zero with Java 25, the current long-term support release: how the JVM runs your code, variables and types, decisions, loops and methods, then classes, records, collections, streams, interfaces, pattern matching and exceptions.

Every lesson is short and packed with quizzes, so you learn by doing. By the end you can write and run real Java programs on your own.

Lessons: 14
Time: 2 h
Level: Beginner

Start the track · Hello, Java

Bronze open
Silver open
Gold locked

Ready to prove it?

Three exams are waiting: Bronze, Silver and Gold.

Go to the exams

What you'll be able to do

Compile and run Java programs, the classic way or as a compact source file
Use types, strings, switch expressions and methods with confidence
Model data with classes, records and sealed interfaces
Process lists and maps with streams and lambdas
Handle errors with exceptions and try-with-resources

The journey

1
Module 1
Modern Java basics

How Java runs, your first program, types, decisions, loops and methods.

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2
Module 2
Objects and collections

Your own types, lists and maps, streams, interfaces, patterns and exceptions.

0 / 5
3
Module 3
Next steps

Real projects, automated tests, massive concurrency and web APIs.

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