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/Java Language

Java Language

https://leanpub.com/java17to21

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String Templates

In this part

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
Tag References
Pattern Matching
Record Patterns
Pattern Matching for switch
Unnamed Patterns and Variables