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Java 16

To run each example use: java --enable-preview --source 16 <FileName.java>

JEPs

  • 338 - Vector API (Incubator)
  • 347 - Enable C++14 Language Features
  • 357 - Migrate from Mercurial to Git
  • 369 - Migrate to GitHub
  • 376 - ZGC: Concurrent Thread-Stack Processing
  • 380 - Unix-Domain Socket Channels
  • 386 - Alpine Linux Port
  • 387 - Elastic Metaspace
  • 388 - Windows/AArch64 Port
  • 389 - Foreign Linker API (Incubator)
  • 390 - Warnings for Value-Based Classes
  • 392 - Packaging Tool
  • 393 - Foreign-Memory Access API (Third Incubator)
  • 394 - Pattern Matching for instanceof
  • 395 - Records
  • 396 - Strongly Encapsulate JDK Internals by Default
  • 397 - Sealed Classes (Second Preview)

Features

  • Pattern Matching for instanceof (standard)
  • Records
    • now we can declare static class or a record in an inner class
  • Warnings for Value-Based Classes
    • starting the preparatives for Project Valhalla (can't wait for it to be fully implemented)
    • warning the using value-based classes in synchronization and flag to force an error (1) or log (2)
      • flag: -XX:DiagnoseSyncOnValueBasedClasses=1|2
    • starting with primitive wrappers (but soon might be expanded)
  • Foreign-Memory Access API (third incubator)
    • change in the API
  • Sealed Classes (second preview)
    • sealed, non-sealed and permits became contextual keywords (we can use it as var name or method name)
  • Unix-Domain Socket Channels

JVM

  • Elastic Metaspace - allow JVM to return unused memory to OS
    • flag to customize: -XX:MetaspaceReclaimPolicy=balanced|aggressive|none
  • Packaging tool promoted to standard
    • changing only on flag: --bind-services to --jlink-options
  • Changed default flag for JDK internals:
    • now it is --illegal-access=deny

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