Java

Java for people starting out: classes, collections, exceptions and the object-oriented ideas the language is built around.

5 guides

Java

Java Records vs Classes (and vs Lombok)

Records are immutable data carriers with the boilerplate written for you. When to use one instead of a class, how they compare…

Sep 22, 2026 4 min read

Java

Java Virtual Threads: How to Use Them (Java 21+)

Virtual threads let you write plain blocking Java and still handle thousands of concurrent tasks. How they work, how to use them,…

Sep 21, 2026 4 min read

Java

Fixing “java is not recognized” after installing Java

Java installed but the terminal cannot find it? The fix is PATH and JAVA_HOME. Step by step for Windows, macOS and Linux,…

Sep 15, 2026 4 min read

Java

Object-Oriented Programming (OOP) in Java

Classes, objects, encapsulation, inheritance and polymorphism in Java — what each one is actually for, with small examples rather than animal metaphors.

Sep 14, 2026 3 min read

Java

Java Basics for Beginners

Java’s structure, types, control flow and the class-and-main-method boilerplate — explained so the ceremony makes sense rather than getting in the way.

Sep 13, 2026 3 min read

Where to go next

Programming Basics The ideas every language shares — variables, loops, functions and how a program actually runs. 13 guides Python Plain-English Python guides, from your first line of code to small programs that do real work. 32 guides JavaScript How JavaScript works in the browser, explained with short examples you can paste and run. 17 guides

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