Overview

Move beyond simple tutorials and build a true foundation in professional software development with Java 21. This book is a comprehensive, hands-on course designed to guide you from your very first line of code to building a complete, tested, and persistent command-line application. It is the definitive starting point for aspiring developers, students, or professionals looking to master one of the world's most enduring programming languages. Written with clarity and a focus on practical application, this guide systematically builds your knowledge from the ground up. You will not just learn the syntax; you will understand the ""why"" behind the core principles of software design. The entire journey is structured to ensure you grasp each concept before moving on, culminating in a final project where you will apply every skill you have learned. Inside, you will find: A Solid Foundation: Start with the absolute basics of Java, from setting up your environment to mastering variables, control flow, and methods. True Object-Oriented Thinking: Progress to a deep understanding of classes, objects, and the four pillars of OOP. Learn not just what they are, but how to think like an object-oriented designer. Modern Java 21 Features: Get up to speed with the latest advancements, including lambda expressions, the Stream API, and the revolutionary new concurrency model with virtual threads and structured concurrency. Real-World Skills: Learn the tools of the trade. Go beyond the language itself to manage your projects with Maven, write professional unit tests with JUnit, handle file I/O, and connect to a database with JDBC. A Complete Capstone Project: Solidify your knowledge by building a book catalog application from start to finish, applying principles of clean design, data persistence, and automated testing. Whether your goal is to start a new career, advance your existing skills, or build your own software, Develop with Java 21 provides the direct and thorough path to writing clean, modern, and effective code.

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