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java-14

README.md

Java 14

To run each example use: java --enable-preview --source 14 <FileName.java>

JEPs

  • 305 - Pattern Matching for instanceof (Preview)
  • 343 - Packaging Tool (Incubator)
  • 345 - NUMA-Aware Memory Allocation for G1
  • 349 - JFR Event Streaming
  • 352 - Non-Volatile Mapped Byte Buffers
  • 358 - Helpful NullPointerExceptions
  • 359 - Records (Preview)
  • 361 - Switch Expressions (Standard)
  • 362 - Deprecate the Solaris and SPARC Ports
  • 363 - Remove the Concurrent Mark Sweep (CMS) Garbage Collector
  • 364 - ZGC on macOS
  • 365 - ZGC on Windows
  • 366 - Deprecate the ParallelScavenge + SerialOld GC Combination
  • 367 - Remove the Pack200 Tools and API
  • 368 - Text Blocks (Second Preview)
  • 370 - Foreign-Memory Access API (Incubator)

Features

  • Switch Expressions
    • Promotion to standard
  • Text Blocks (second preview)
    • added new flags
  • Pattern Matching for instanceof (preview)
    • added as Preview
  • Records (preview)
    • added as Preview
    • Notes:
      • Does not have a extends clause, only extends java.lang.Record;
      • Is implicitly final, thus cannot be extended;
      • Cannot declare other fields and cannot contain instance initializers, it only contains its components declared at record header;
      • Its components are final and cannot be updated via reflection (throw IllegalAccessException);
      • Cannot declare native methods;
      • Local records is always static (local class and enum as never static).
  • JFR Event Streaming
    • Here is a great example of a tool built

JVM

  • Helpful NullPointerExpections
    • flag to enable: -XX:+ShowCodeDetailsInExceptionMessages
  • Packaging tool to create self-contained Java applications
    • bin: jpackage

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