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https://github.com/wesleyegberto/java-new-features

Exploring Java 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23
https://github.com/wesleyegberto/java-new-features

java-10 java-11 java-12 java-13 java-14 java-15 java-16 java-17 java-18 java-19 java-20 java-21 java-22 java-23 java-8 java-9

Last synced: 6 days ago
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Exploring Java 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23

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README 

        
# Java New Features



A project to explore more about the new features from Java 8 through Java 21.



[JDK Release Notes](https://www.oracle.com/java/technologies/javase/jdk-relnotes-index.html)



## OpenJDK Projects



* [Valhalla](./projects/valhalla/): enhance Java object model with value objects and primitive values.

* [Loom](./projects/loom/): project to bring user-mode threads.



## Resume by Version



* [Java 24](java-24/)



* [Java 23](java-23/) (Sep, 2024)

  * Primitive Types in Patterns, `instanceof` and `switch` (preview)

  * Class-File API (preview 2)

  * Stream Gatherers (preview 2)

  * Markdown Documentation Comments

  * Module Import Declarations (preview)

  * Implicity Declared Classes and Instance Main Methods (preview 3)

  * Structured Concurrency (preview 3)

  * Scoped Value (preview 3)

  * Flexible Constructor Bodies (preview 2)



* [Java 22](java-22/) (Mar, 2024)

  * Statements before `super` (preview)

  * FFM API (standard)

  * Unnamed Variable & Patterns

  * Launch Multi-File Source-Code Programs

  * String Templates (preview 2)

  * Stream Gatherers (preview)

  * Structured Concurrency (preview 2)

  * Scoped Value (preview 2)

  * Class-File API (preview)

  * Implicity Declared Classes and Instance Main Methods (preview 2)



* [Java 21](java-21/) (LTS; Sep, 2023)

  * Virtual Threads (standard) :rocket:

  * Record Pattern (standard) :rocket:

  * Pattern Matching for `switch` (standard) :rocket:

  * Sequenced Collections

  * String Templates (preview)

  * Foreign Function & memory API (preview 3)

  * Unnamed Patterns and Variables (preview)

  * Unnamed Classes and Instance Main Methods (preview)

  * Prepare to Disallow the Dynamic Loading of Agents

  * KEM API

  * Structured Concurrency (preview)

  * Scoped Value (preview)



* [Java 20](java-20/) (Mar, 2023)

  * Scoped values (incubator)

  * Record pattern (preview 2)

  * Pattern matching for `switch` (preview 4)

  * Foreign Function & memory API (preview 2)

  * Virtual Threads (preview 2)

  * Structured concurrency (second incubator)



* [Java 19](java-19/) (Sep, 2022)

  * Virtual Thread (preview) :rocket:

  * Pattern matching for `switch` (preview 3)

  * Vector API (fourth incubator)

  * Record pattern (preview)

  * Structured concurrency (incubator)



* [Java 18](java-18/) (Mar, 2022)

  * UTF-8 by Default

  * Simple Web Server

  * Code Snippets in Java API Documentation

  * Pattern matching for `switch` (preview 2)

  * Deprecated method `finalize`



* [Java 17](java-17/) (LTS; Sep, 2021)

  * Sealed classes (standard)

  * Pattern matching for `switch` (preview)

  * Enhanced Pseudo-Random Number Generator

  * Deprecate the Applet API for Removal

  * New macOS rendering for Java 2D API

  * Remove the experimental AOT and JIT compiler



* [Java 16](java-16/) (Mar, 2021)

  * Records (standard)

  * Pattern matching for `instanceof` (standard)

  * Sealed classes (preview 2)

  * Unix-Domain Socket Channels

  * Warnings for Value-Based Classes

  * Foreign-Memory Access API (incubator)

  * Vector API (incubator)

  * Foreign Linker API (incubator)

  * Packaging Tool



* [Java 15](java-15/) (Sep, 2020)

  * Sealed classes (preview)

  * Hidden classes

  * DatagramSocket reimplementation

  * Pattern matching for `instanceof` (preview 2)

  * Records (preview 2)

  * Foreign-Memory Access API (incubator)

  * GCs ZGC and Shenandoah turned final



* [Java 14](java-14/) (Mar, 2020)

  * Switch expression (standard)

  * Pattern matching for `instanceof` (preview)

  * Text blocks improvements (preview 2)

  * Records (preview)

  * Helpful NullPointerExceptions

  * Packaging tool

  * JFR even streaming



* [Java 13](java-13/) (Sep, 2019)

  * Switch expression (preview 2)

  * Text blocks (preview)

  * String API updates

  * NIO updates

  * Socket and ServerSocket reimplementation (Project Loom)

  * Dynamic CDS Archives

  * ZGC: Uncommit Unused Memory



* [Java 12](java-12/) (Mar, 2019)

  * Switch expression (preview)

  * Compact Number Format

  * Collectors improvements

  * CompletableFuture improvements

  * CDS enable by default

  * New GC and improvements



* [Java 11](java-11/) (LTS; Sep, 2018)

  * Removal of Java EE Modules, JavaFX and deprecated API

  * Http Client (incubator)

  * var in lambda expressions

  * API improvements

  * Null I/O



* [Java 10](java-10/) (Mar, 2018)

  * Process API improvements

  * Collections improvements

  * Application Class-Data Sharing

  * `var` keyword to declare variables



* [Java 9](java-9/) (Sep, 2017)

  * Milling Project Coin

  * Process API

  * Platform Logging API and Service

  * Concurrency improvements

  * Collections improvements

  * Project Jigsaw

  * Segmented code cache

  * JShell

  * much more (see JEPs)



* [Java 8](java-8/) (Marc, 2014)

  * API

  * Stream API

  * Project Lambda

  * Repeating annotations



## Running



### Java and Javac



You will need to provide the flag to enable preview and the number of Java version:



```bash

java --enable-preview --source 21 SourceCode.java



javac --enable-preview --source 21 SourceCode.java

```



### JShell



To use JShell you can use the following flag:



```bash

jshell --enable-preview

```



### Maven



* Maven: 3.5.0

  * compiler plugin: 3.8.0

  * surefire and failsafe: 2.22.0

  * plugins using ASM (e.g. the shade plugin) will likely need to be updated as well



  To run the examples with Maven use:



```xml



    maven-compiler-plugin

    

        ${java.version}

        --enable-preview

    



    maven-surefire-plugin

    

        --enable-preview

    



    maven-failsafe-plugin

    

        --enable-preview

    



```



## Helpful Links



* [OpenJDK Projects](https://openjdk.java.net/projects/)

* [JDK Update Releases](https://openjdk.org/projects/jdk-updates/)

* [The Java Version Almanac](https://javaalmanac.io/)

* [Dev.java - tutorials, news and more](https://dev.java/)

  * [Java Platform Evolution](https://dev.java/evolution/)

  * [Java Playground](https://dev.java/playground/)

* [Inside.java - Sip of Java](https://inside.java/2021/10/21/sip24/)

* Download Java versions:

  * [The Role of Preview Features in Java and Beyond](https://blogs.oracle.com/javamagazine/the-role-of-previews-in-java-14-java-15-java-16-and-beyond)

  * [Place to get early releases from Oracle's JDK](https://jdk.java.net/)

  * [Oracle - Java Binaries Archive](https://www.oracle.com/java/technologies/downloads/archive/#JavaSE)

  * [Archived OpenJDK General-Availability Releases](https://jdk.java.net/archive/)

* [Considerations Bumping Java EE](https://vorozco.com/blog/2020/2020-08-21-considerations-bumping-javaee.html)

* Migration tools:

  * [Migrating From JDK 8 to Later JDK Releases](https://docs.oracle.com/en/java/javase/17/migrate/migrating-jdk-8-later-jdk-releases.html#GUID-7744EF96-5899-4FB2-B34E-86D49B2E89B6)

  * [Eclipse Migration Toolkit for Java (EMT4J) Simplifies Upgrading Java Applications](https://www.infoq.com/news/2022/12/eclipse-migration-toolkit-java/)

  * [Rewrite - Migrate to Java 17](https://docs.openrewrite.org/running-recipes/popular-recipe-guides/migrate-to-java-17)

* Presentations:

  * [The Amazing Features of Modern Java - Venkat Subramaniam](https://youtu.be/nlZe-y2XvQY)

* Java Projects:

  * [Project Leyden - Capturing Lightning in a Bottle](https://www.youtube.com/watch?v=lnth19Kf-x0&ab_channel=Java)

* Blogs:

  * [JDK Security Enhancements - Sean Mullan](https://seanjmullan.org/blog/)