Sealed Classes and Interfaces in Java Explained Mastering Restricted Class Hierarchies in Modern Java

Master restricted class hierarchies in modern Java with this comprehensive guide to one of Java's most powerful features.
Sealed classes and interfaces represent a paradigm shift in Java programming, offering developers unprecedented control over class hierarchies. Introduced in Java 15 and standardized in Java 17, this feature fills the long-standing gap between completely open and completely closed inheritance models in Java.
In "Sealed Classes and Interfaces in Java Explained," expert Java developer Dionys Boscarelli takes you on a comprehensive journey through this powerful language feature. This book reveals how sealed types can transform your approach to domain modeling, API design, and type safety in modern Java applications.
Traditional Java inheritance has always been an all-or-nothing proposition-classes were either final (closed to extension) or completely open to unlimited subclassing. Sealed classes and interfaces change this paradigm by allowing developers to explicitly define which classes can extend or implement a given type, creating controlled, restricted hierarchies that many real-world domains naturally require.
Starting with foundational concepts, this book progresses through practical implementations to advanced applications. You'll learn:How to declare and use sealed classes and interfaces effectivelyTechniques for modeling restricted domains with sealed hierarchiesWays to integrate sealed types with records, pattern matching, and switch expressionsStrategies for designing robust APIs and libraries using sealed typesApproaches for migrating existing codebases to leverage sealed hierarchiesBest practices for testing and debugging sealed type implementationsThe book includes numerous code examples, design patterns, and real-world case studies that demonstrate how sealed types solve common modeling problems in Java. Special attention is given to how sealed classes work harmoniously with other modern Java features to create more expressive, maintainable code.
Whether you're building enterprise applications, designing Java libraries, or simply want to stay current with Java's evolution, this book provides the knowledge and techniques you need to master sealed classes and interfaces in modern Java. Perfect for intermediate to advanced Java developers, this guide will transform how you approach inheritance and domain modeling in your Java applications.
Unlock the full potential of Java's type system and write more robust, expressive code with "Sealed Classes and Interfaces in Java Explained."

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