https://github.com/shirleynekodev/miko-java-11-23-overview

https://github.com/shirleynekodev/miko-java-11-23-overview

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• Host: GitHub
• URL: https://github.com/shirleynekodev/miko-java-11-23-overview
• Owner: ShirleyNekoDev
• Created: 2024-12-04T14:23:06.000Z (6 months ago)
• Default Branch: main
• Last Pushed: 2024-12-04T16:47:05.000Z (6 months ago)
• Last Synced: 2025-03-26T20:57:31.909Z (2 months ago)
• Size: 15.6 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
Sind wir bereit für Java 23? - Übersicht neuer (Preview-)Features seit Java 11

==============================================================================

Leyden & Lilliput, Jigsaw & Loom, Panama & Valhalla, Amber & Shenandoah – all dies sind Projekte unter OpenJDK, die die Java-Sprache und Java-VM weiterentwickeln sollen. Wir werden uns anschauen welche neuen Features in den letzten Jahren vorgestellt wurden und worauf wir uns in der Java-Zukunft noch freuen können.

Wir werden uns auf 3 Hauptschwerpunkte fokussieren: Javas Implementierung von Coroutinen mittels virtueller Threads und Structured Concurrency; neue Sprach-Features und Syntactic Sugar rund um Records, Pattern-Matching und String-Templates; sowie die neue Schnittstelle für native Funktionsaufrufe, Off-Heap-Speicher und Vektoroperationen. Falls noch Zeit ist können wir auch darauf eingehen, wie die JVM-Startzeit reduziert werden kann und was mittlerweile für alternative Garbage-Collector existieren.

Diese MiKo soll auch ein Recap für alle Projekte bieten, die zuletzt den Feature-Stand von Java 11 verwenden mussten und zeigen, was mit den LTS-Versionen Java 17 und 21 möglich wird und welche API-Änderungen sich in der Zeit ergeben haben.

Why so many new Java versions?

------------------------------

- "new" 6-month feature release model (since Java 9 2018)

- releases each March / September with support period until next release

- LTS versions every 2 years (3 years before Java 17)

- push many new features in shorter time with less presure to make it in time for the next release

- allow experimental features and collect feedback iteratively

Feature Types

-------------

- normal features

- preview features

  - fully specified and implemented, but not yet permanent

  - to gather developer feedback based on real-world use before making the feature permanent

  - enabled via --enable-preview compiler flag

- experimental features

  - early versions of features, often at the VM level, which can be risky, incomplete, or unstable

  - to test and iterate on new ideas that are not yet ready for broader use

  - enabled using specific flags

- incubating features ([Incubator](https://openjdk.org/jeps/11))

  - experimental APIs distributed as separate modules prefixed with jdk.incubator.

  - to allow developers to try out new APIs that are still in development

  - modules need to be explicitly added to the project

Overview

--------

- [Project Jigsaw](./feature-sets/Project_Jigsaw.md):

  module system for the Java language, JDK sources and Java runtime

- [Project Amber](./feature-sets/Project_Amber.md):

  small utilities & syntactic sugar to make development easier

- [Project Loom](./feature-sets/Project_Loom.md):

  new lightweight, high-throughput concurrency model

- [Project Panama](f./eature-sets/Project_Panama.md):

  foreign function and memory API

- [Project Valhalla](./feature-sets/Project_Valhalla.md):

  value classes, primitive classes, and primitive generics

- [Project Lilliput](./feature-sets/Project_Lilliput.md):

  reduce object header size

- [Project Leyden](./feature-sets/Project_Leyden.md):

  improve startup time, time to peak performance, and footprint of Java programs

- [Features Outside of Projects](./feature-sets/others.md)