From Java 17 to Java 21
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From Java 17 to Java 21

Upgrade to Java 21 from Java 17

About the Book

Changes from Java 17 to Java 21

Included in the book:

  • Pattern matching
  1. Record patterns
  2. Pattern matching for switch,
  3. Unnamed patterns and variables
  • Multi-threading
  1. Virtual threads
  2. Structured concurrency
  3. Scoped values
  • Standard library changes
  1. UTF-8 by default
  2. Internet-address resolution SPI
  3. Simple web server
  4. Sequenced collections
  5. Key Encapsulation Mechanism API
  • Java languages
  1. String templates
  2. Code snippets in Java API documentation
  3. Unnamed classes and instance main methods
  • Panama project
  1. Foreign Function & Memory API
  2. Vector API

If you are currently using Java 11, check out another book From Java 11 to 17.

About the Author

Fu Cheng
Fu Cheng

Full-stack software developer and content creator.

  • Understanding the Java 7: the Core techniques and best practice (Simplified Chinese edition) covers Java SE 7 new features and deep dive of Java platform core features.
  • Build Mobile Apps with Ionic 2 and Firebase covers building mobile apps using Ionic 2 and Firebase.
  • Exploring Java 9 covers Java 9 module system and other new features.
  • A regular author on IBM developerWorks China and InfoQ China website with more than 50 published technical articles covering various technical topics.

Bundles that include this book

Bought separately
Minimum price
Suggested price
Bought separately
Minimum price
Suggested price

Table of Contents

    • Introduction
      • JEPs in Different Java Releases
        • Java 18
        • Java 19
        • Java 20
        • Java 21
      • Install Java 21
      • Build Tools
      • Source Code
    • Java Language
      • String Templates
        • Template Expressions
        • String Template
        • Template Processor
        • SMS Message Template
        • Format Processor
      • Unnamed Classes and Instance Main Methods
        • Java Program Launch Protocol
        • Unnamed Classes
      • Code Snippets in Java API Documentation
        • Inline Snippets
        • External Snippets
        • Markup Tags
          • Regions
          • Highlight Text
          • Replace Text
          • Link Text
        • Tag References
    • Pattern Matching
      • Record Patterns
        • Nested Record Patterns
        • Generic Record Types
      • Pattern Matching for switch
        • null in switch
        • Guarded Case Label
        • Enum Constants in switch
      • Unnamed Patterns and Variables
        • Unnamed Patterns
        • Unnamed Variables
    • Standard Library
      • UTF-8 By Default
      • Internet-Address Resolution SPI
      • Simple Web Server
      • Sequenced Collections
        • SequencedCollection
        • SequencedSet
        • SequencedMap
        • Classes Hierarchy
      • Reimplement Core Reflection with Method Handles
      • Key Encapsulation Mechanism API
    • Multi-threading
      • Virtual Threads
        • Create Virtual Threads
        • Virtual Threads Basics
        • Thread-local Variables
        • Scheduling of Virtual Threads
        • Execution of Virtual Threads
        • ExecutorService
        • Debugging
          • Thread Dump
          • JFR
      • Structured Concurrency
        • Basic Usage
        • invokeAll
        • invokeAny
        • Shutdown and Close of StructuredTaskScope
      • Scoped Values
    • Project Panama
      • Foreign Function & Memory API
        • Foreign Memory
        • Memory Segments
        • Arenas
        • Dereferencing Memory Segments
        • Memory Layouts
          • Padding Layout
          • Sequence Layout
          • Group Layout
        • Dereferencing Memory Layouts
        • More About Arenas
        • Foreign Functions
          • Downcall - Call from Java to Native
          • Upcall - Call From Native To Java
      • Vector API
        • API Basics
        • Euclidean Distance Calculation
    • JVM
      • Generational ZGC
      • Prepare to Disallow the Dynamic Loading of Agents
    • Deprecated & Removed Features
      • Deprecated Features
        • Finalization
          • finalize in Object
        • Windows 32-bit x86 Port
    • Miscellaneous
      • Linux/RISC-V Port

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