java-tutorial

Java Tutorial (Beginner → Advanced)

A practical, step-by-step Java tutorial designed to be beginner-friendly while still taking you all the way to advanced, real-world Java skills.

How to use this tutorial

• Read chapters in order under docs/tutorial/.
• After each chapter, do the exercises.
• Run the matching code samples under examples/plain/.

Prerequisites

• A JDK installed (Java 17+ recommended).
• VS Code + Java extensions (or IntelliJ).

Table of contents

1. Getting Started: Install, run, and your first program
2. Java Basics: types, variables, operators, formatting
3. Control Flow: if/switch/loops
4. Methods: parameters, return values, overloading
5. OOP: classes, objects, encapsulation
6. Inheritance & Polymorphism (and when not to use them)
7. Interfaces, abstract classes, and design basics
8. Exceptions and error handling
9. Strings, files, and I/O basics
10. Collections: List/Set/Map and Big-O intuition
11. Generics (the useful parts)
12. Lambdas & Streams
13. Dates and time (java.time)
14. Testing with JUnit 5 (basics)
15. Concurrency: threads, executors, futures
16. JVM basics: memory, GC, performance habits
17. Build tools: Maven essentials (recommended)
18. Next steps: projects to build

Running the code examples

See: examples/plain/README.md