This is the e-book version of the book that you can read online.

Prepare for the Java 21 certification exam (Exam 1Z0-830) with this comprehensive study guide. This book will give you the knowledge and skills necessary to pass the exam and gain a deep understanding of Java's core features and advanced topics.

Each chapter provides in-depth explanations, practical examples, and best practices to reinforce your learning and help you grasp the key concepts. Additionally, at the end of each chapter, you'll find a summary of key points and practice questions designed to test your understanding and prepare you for the certification exam.

With this guide, you will:

• Develop a solid foundation in object-oriented programming concepts, including classes, objects, inheritance, and polymorphism


• Learn how to effectively use records and enums to create immutable data carriers and predefined constants


• Understand Java's data handling capabilities, including primitive types, reference types, and the Collections Framework


• Explore control flow structures and techniques for managing program execution flow efficiently


• Discover functional programming with lambda expressions, method references, and the Stream API


• Understand Java's concurrency and multithreading capabilities, including thread creation, synchronization, virtual threads, and the Concurrency API


• Become proficient in the Date/Time API for handling dates, times, and durations with ease


• Learn how to perform efficient file I/O operations using the NIO.2 API


• Explore the Java Platform Module System (JPMS) for creating modular and encapsulated applications


• Discover Java's localization capabilities for creating internationalized applications

By the end of this book, you will be well-prepared to tackle the Java 21 certification exam (Exam 1Z0-830) with confidence.