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Java 21 Study Guide

Ars-Digitale/java-21-study-guide

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Table of contents
- Volume I — Java 21
- 🌍 Choose your language
English
English
- Index
- Module 00 — Prerequisites & Setup
  Module 00 — Prerequisites & Setup
  - Prerequisite material
  - Eclipse shortcuts
- Module 01 — Java Language Basics
  Module 01 — Java Language Basics
- Module 02 — Control Flow
  Module 02 — Control Flow
  - Control flow statements
  - Loops
- Module 03 — Core Standard APIs
  Module 03 — Core Standard APIs
- Module 04 — Object-Oriented Fundamentals
  Module 04 — Object-Oriented Fundamentals
- Module 05 — Functional Programming
  Module 05 — Functional Programming
  - Functional programming in Java
  - Java streams
- Module 06 — Collections Framework
  Module 06 — Collections Framework
- Module 07 — Concurrency and Threads
  Module 07 — Concurrency and Threads
  - Thread fundamentals
  - Concurrency APIs
- Module 08 — Java I/O and NIO
  Module 08 — Java I/O and NIO
- Module 09 — Java Platform Module System (JPMS)
  Module 09 — Java Platform Module System (JPMS)
Italiano
Italiano
- Indice
- Module 00 — Prerequisites & Setup
  Module 00 — Prerequisites & Setup
  - Materiale propedeutico
  - Eclipse shortcuts
- Modulo 01 — Fondamenti del Linguaggio Java
  Modulo 01 — Fondamenti del Linguaggio Java
- Modulo 02 — Controllo di Flusso
  Modulo 02 — Controllo di Flusso
  - Istruzioni di controllo
  - Cicli
- Modulo 03 — API Standard
  Modulo 03 — API Standard
- Modulo 04 — Fondamenti OOP
  Modulo 04 — Fondamenti OOP
- Modulo 05 — Programmazione Funzionale
  Modulo 05 — Programmazione Funzionale
  - Programmazione funzionale in Java
  - Stream Java
- Modulo 06 — Collections Framework
  Modulo 06 — Collections Framework
- Modulo 07 — Concorrenza e Thread
  Modulo 07 — Concorrenza e Thread
  - Fondamenti thread
  - API di concorrenza
- Modulo 08 — I/O e NIO
  Modulo 08 — I/O e NIO
- Modulo 09 — JPMS
  Modulo 09 — JPMS
Français
Français
- Index
- Module 00 — Prerequisites & Setup
  Module 00 — Prerequisites & Setup
  - Matériel de support
  - Eclipse shortcuts
- Module 01 — Bases du Langage Java
  Module 01 — Bases du Langage Java
- Module 02 — Contrôle de flux
  Module 02 — Contrôle de flux
  - Instructions de contrôle
  - Boucles
- Module 03 — API Standard
  Module 03 — API Standard
- Module 04 — Fondamentaux OO
  Module 04 — Fondamentaux OO
- Module 05 — Programmation fonctionnelle
  Module 05 — Programmation fonctionnelle
  - Programmation fonctionnelle en Java
  - Streams Java
- Module 06 — Framework des Collections
  Module 06 — Framework des Collections
- Module 07 — Concurrence et Threads
  Module 07 — Concurrence et Threads
  - Fondamentaux des threads
  - API de concurrence
- Module 08 — I/O et NIO
  Module 08 — I/O et NIO
- Module 09 — JPMS
  Module 09 — JPMS
Ars Digitale

Ars Digitale Technical Guides

Volume I — Java 21

Version 1.0 — February 2026

Publisher: Ars Digitale

This guide is part of the Ars Digitale Technical Guides series —
a structured collection of engineering-focused references.

The Java 21 volume provides a modular, concept-driven overview of the language and core APIs, designed for engineers who prefer clarity, structure, and long-term understanding.

🌍 Choose your language

🇬🇧 English → English Edition
🇮🇹 Italiano → Edizione Italiana
🇫🇷 Français → Édition Française

© 2026 Ars Digitale