From Java 17 to Java 21

Fu Cheng

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Table of Contents

Introduction

Introduction

Java Language

String Templates
Unnamed Classes and Instance Main Methods
- Java Program Launch Protocol
- Unnamed Classes
Code Snippets in Java API Documentation
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
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

From Java 17 to Java 21/Project Panama/Foreign Function & Memory API

Foreign Function & Memory API

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Foreign Memory

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Memory Segments

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Arenas

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Dereferencing Memory Segments

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Memory Layouts

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Padding Layout

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Sequence Layout

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Group Layout

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Dereferencing Memory Layouts

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More About Arenas

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Foreign Functions

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Downcall - Call from Java to Native

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Upcall - Call From Native To Java

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Up next

Vector API

In this chapter

Foreign Function & Memory API
Foreign Memory
Memory Segments
Arenas
Dereferencing Memory Segments
Memory Layouts
Dereferencing Memory Layouts
More About Arenas
Foreign Functions