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/Multi-threading/Virtual Threads

Virtual Threads

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Create Virtual Threads

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Virtual Threads Basics

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Thread-local Variables

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Scheduling of Virtual Threads

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Execution of Virtual Threads

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`ExecutorService`

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Debugging

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Thread Dump

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JFR

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Up next

Structured Concurrency

In this chapter

Virtual Threads
Create Virtual Threads
Virtual Threads Basics
Thread-local Variables
Scheduling of Virtual Threads
Execution of Virtual Threads
ExecutorService
Debugging