Java Mastery

Description

Learn Java the way professional developers actually use it, from “Hello, World” to building, securing, testing and deploying real Spring Boot backends.

Java Mastery is a complete, step-by-step guide in one book. You don’t need to piece together scattered tutorials. It starts with what programming is and how to install the JDK. It ends with REST APIs, microservices, Docker, CI/CD, system design and interview preparation. The book is written for Java 25 LTS and Spring Boot 4.1, and the technical baseline was checked in October 2026, so you’re learning current, modern Java rather than outdated syntax.

What you’ll learn across 64 chapters:

• Getting started: programming fundamentals, JDK setup, your first program, variables, operators, input and output, conditions, loops, methods, arrays and Big O
• Object-oriented programming: classes, encapsulation, inheritance, polymorphism, interfaces, enums, records, sealed classes, equals and hashCode, and SOLID design
• Core Java and standard libraries: strings, exceptions, collections, generics, lambdas, the Stream API, Optional, date and time, file I/O, regex, multithreading, virtual threads, JVM internals, reflection, networking and JDBC
• Tools and professional practice: Git, Maven and Gradle, testing, clean code and design patterns
• Backend development with Spring Boot: architecture, REST APIs, SQL and database design, JPA and Hibernate, Spring Data, validation, Spring Security, testing, observability, microservices, messaging, caching, Docker and CI/CD
• Professional engineering: application security, cloud-native Java, data structures and algorithms, system design, and career and interview preparation
• Reference: a Java quick reference, HTTP status codes, a glossary and a learning roadmap

You’ll build 8 real-world projects of increasing difficulty:

1. Student Grade Management System
2. Library Management System
3. Banking System with JDBC
4. Inventory Management REST API
5. E-Commerce Backend
6. Task Manager with Authentication
7. Event-Driven Order Platform
8. Scalable URL Shortener

The book is for complete beginners writing their first line of code, developers coming from another language, and Java programmers who want to move into professional Spring Boot backend work. If you already code, skim Part I and dive in from Part II.

Format: PDF, 1,040 pages.

This is an independent publication and is not affiliated with or endorsed by Oracle, the OpenJDK project, Broadcom or the Spring project.