Java 9

• Java Platform Module System

• JEP 222: Jshell - REPL

• JEP 158: Unified VM logging

  • Provides a common logging system for JVM components (-Xlog)

• HTML5 Javadoc

  • A tool that can generate APIs in HTML5 format

• Language Update

  • try-with-resources improvements
  • private interface method
    • Interfaces always had to be defined as public, but private is now also allowed
  • diamond operator
    • The diamond operator is now possible in anonymous inner classes as well

• New Core Libraries

  • Process API
  • JEP264: Platform Logging API and Service
  • http://openjdk.java.net/jeps/264
  • Enhanced CompletableFuture API
  • Reactive Streams - Flow API
  • https://thepracticaldeveloper.com/2018/01/31/reactive-programming-java-9-flow/
  • Factory Methods for Collections (List, Set, Map)
  • Collections created with static factory methods are immutable
  • Enhanced Deprecation
  • Stack-Walking API
  • Other Improvements
  • Stream improvements
  • iterate(), takeWhile()/dropWhile(), ofNullable()
  • Optional improvements

• JEP 11 : HTTP 2.0 (Incubator Modules)

  • http://openjdk.java.net/jeps/110

• Client Technologies

  • Multi-Resolution Images
  • TIFF Image I/O Plugins

• Internationalization

  • Unicode 8.0
  • Java 8 supports Unicode 6.2
  • UTF-8 Properties files
  • Default Localte Data Change

For the various features and improvements added in Java 9, please refer to the following link.

• https://docs.oracle.com/javase/9/whatsnew/toc.htm#JSNEW-GUID-C23AFD78-C777-460B-8ACE-58BE5EA681F6

One of the big changes in Java 9 is the introduction of the module system. This is also a big change with much to study, so I plan to post about it as it gets organized.