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Java 25: A Developer's Guide
Paperback
Publisher: Independently Published
Published: Jun 24 2026
Pages: 612
Weight: 2.63
Height: 1.24 Width: 8.00 Depth: 10.00
Language: English
Master Java 25: From Language Features to Production Performance
Java 25 is here, and it's one of the most significant releases in years. Whether you're a working developer, a backend engineer, or a technical lead deciding whether to upgrade, this hands-on guide walks you through everything Java 25 delivers-and shows you how to put it to work with real code.
Chapter 1: Introduction to Java 25Chapter 3: Java 25 vs Java 21 - What's Changed
Chapter 4: Primitive Patterns in Java 25 (JEP 507)
Chapter 5: Module Import Declarations (JEP 511)
Chapter 6: Compact Source Files and Simpler Programs (JEP 512)
Chapter 7: Flexible Constructor Bodies (JEP 513)
Chapter 8: Structured Concurrency in Java 25 (JEP 505)
Chapter 9: Scoped Values in Java 25
Chapter 10: StableValue in Java 25
Chapter 11: Compact Object Headers (JEP 519)
Chapter 12: Ahead-of-Time Command-Line Ergonomics (JEP 514)
Chapter 13: Ahead-of-Time Method Profiling (JEP 515)
Chapter 14: Generational Shenandoah GC (JEP 521)
Chapter 15: JFR CPU-Time Profiling in Java 25
Chapter 16: JFR Cooperative Sampling (JEP 518)
Chapter 17: JFR Method Timing and Tracing (JEP 520)
Chapter 18: Safe Key Derivation (JEP 510)
Chapter 19: Removal of 32-bit x86
Chapter 20: Preview Features and Java's Future Direction
Chapter 21: Vector API in Java 25
Chapter 22: Is Java 25 Worth Adopting?
Across 22 focused chapters packed with code snippets and working examples, you'll move from a clear overview of what's new to deep, practical coverage of every major feature. Start by understanding how Java 25 differs from Java 21, then dive into the language updates reshaping how you write code: Primitive Patterns, Module Import Declarations, Compact Source Files, and Flexible Constructor Bodies.
From there, you'll master modern concurrency with Structured Concurrency, Scoped Values, and StableValue-tools that make multithreaded code safer and easier to reason about. You'll go under the hood of the JVM with Compact Object Headers, Ahead-of-Time compilation and method profiling, and the Generational Shenandoah garbage collector.
The book also gives serious attention to observability and production readiness, with full chapters on JFR CPU-time profiling, cooperative sampling, and method timing and tracing-so you can diagnose and tune real applications with confidence. You'll cover platform and security changes including Safe Key Derivation and the removal of 32-bit x86, explore high-performance computing with the Vector API, and look ahead at preview features shaping Java's future.
True to the Java Hands-On approach, every chapter pairs clear explanations with runnable code snippets and complete working examples-so you don't just read about each feature, you see it in action and can try it yourself. You'll understand not just what changed, but why it matters and how to use it.
By the end, you'll be equipped to answer the question that brought you here: Is Java 25 worth adopting?
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