From Java 17 to Java 21

Fu Cheng

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Table of Contents

Introduction

Introduction
- JEPs in Different Java Releases
- Install Java 21
- Build Tools
- Source Code

Java Language

String Templates
Unnamed Classes and Instance Main Methods
- Java Program Launch Protocol
- Unnamed Classes
Code Snippets in Java API Documentation
- Inline Snippets
- External Snippets
- Markup Tags
- Tag References
Pattern Matching

Core Library

UTF-8 By Default
Internet-Address Resolution SPI
Simple Web Server
Sequenced Collections
Reimplement Core Reflection with Method Handles
Key Encapsulation Mechanism API

Multi-threading

Virtual Threads
Structured Concurrency
Scoped Values

Project Panama

Foreign Function & Memory API
- Foreign Memory
- Memory Segments
- Arenas
- Dereferencing Memory Segments
- Memory Layouts
- Dereferencing Memory Layouts
- More About Arenas
- Foreign Functions
Vector API
- API Basics
- Euclidean Distance Calculation

JVM

Generational ZGC
Prepare to Disallow the Dynamic Loading of Agents

Deprecated & Removed Features

Deprecated Features
- Finalization
- Windows 32-bit x86 Port

Miscellaneous

Linux/RISC-V Port
Annotation Processing

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Pattern Matching

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Code Snippets in Java API Documentation
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External Snippets
Markup Tags
Tag References