Welcome to the W3Docs Learn Java tutorial. Java is a general-purpose, object-oriented programming language that powers everything from Android apps and enterprise backends to data processing pipelines. Programs compile to bytecode and run on the Java Virtual Machine (JVM), which gives you strong portability across operating systems once a compatible runtime is installed.

This book assumes you are new to Java or want a structured refresher. You will see how the language is organized, how source files become runnable programs, and how to read and write basic code with confidence.

Start here

Begin with the full introduction, which covers the Java platform, the JDK, and a minimal Hello World example you can type and run locally:

Introduction to Java programming

Additional chapters will appear here as the tutorial grows. Until then, use the introduction as your single reference page for core concepts.