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/Pattern Matching

Pattern Matching

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Record Patterns

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Nested Record Patterns

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Generic Record Types

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Pattern Matching for `switch`

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`null` in `switch`

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Guarded Case Label

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Enum Constants in `switch`

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Unnamed Patterns and Variables

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Unnamed Patterns

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Unnamed Variables

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Up next

UTF-8 By Default

In this chapter

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