Java New Features

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

JDK Release Notes

OpenJDK Projects

Valhalla: enhance Java object model with value objects and primitive values.
Loom: project to bring user-mode threads.

Resume by Version

Java 21 (LTS)
- Virtual Threads (standard) 🚀
- Record Pattern (standard) 🚀
- Pattern Matching for switch (standard) 🚀
- 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
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 (Sep, 2022)
- Virtual Thread (preview) 🚀
- Pattern matching for switch (preview 3)
- Vector API (fourth incubator)
- Record pattern (preview)
- Structured concurrency (incubator)
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 (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 (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 (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 (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 (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 (Mar, 2019)
- Switch expression (preview)
- Compact Number Format
- Collectors improvements
- CompletableFuture improvements
- CDS enable by default
- New GC and improvements
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 (Mar, 2018)
- Process API improvements
- Collections improvements
- Application Class-Data Sharing
- var keyword to declare variables
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 (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:

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

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

JShell

To use JShell you can use the following flag:

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:

<plugin>
    <artifactId>maven-compiler-plugin</artifactId>
    <configuration>
        <release>${java.version}</release>
        <compilerArgs>--enable-preview</compilerArgs>
    </configuration>
</plugin>
<plugin>
    <artifactId>maven-surefire-plugin</artifactId>
    <configuration>
        <argLine>--enable-preview</argLine>
    </configuration>
</plugin>
<plugin>
    <artifactId>maven-failsafe-plugin</artifactId>
    <configuration>
        <argLine>--enable-preview</argLine>
    </configuration>
</plugin>

wesleyegberto/java-new-features

wesleyegberto

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