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PseudoRandomNumberGeneratorTest.java

PseudoRandomNumberGeneratorTest.java

 
 

README.md

README.md

 
 

SwitchWithPatternMatching.java

SwitchWithPatternMatching.java

 
 

README.md

Java 17

To run each example use: java --enable-preview --source 17 <FileName.java>

JEPs

  • 306 - Restore Always-Strict Floating-Point Semantics
  • 356 - Enhanced Pseudo-Random Number Generators
  • 382 - New macOS Rendering Pipeline
  • 391 - macOS/AArch64 Port
  • 398 - Deprecate the Applet API for Removal
  • 403 - Strongly Encapsulate JDK Internals
  • 406 - Pattern Matching for switch (Preview)
  • 407 - Remove RMI Activation
  • 409 - Sealed Classes
  • 410 - Remove the Experimental AOT and JIT Compiler
  • 411 - Deprecate the Security Manager for Removal
  • 412 - Foreign Function & Memory API (Incubator)
  • 414 - Vector API (Second Incubator)
  • 415 - Context-Specific Deserialization Filters

Features

  • Sealed Classes (standard)
  • Pattern Matching for switch (preview)
    • improved switch to support pattern matching for types (like instanceof)
    • support for null case
    • support for guards where we can use a boolean expression like case String s && s.length > 10:
  • Pseudo-Random Number Generators (PRNG)
    • created new classes to generate number
    • two groups of PRNG algorithms:
      • splittable (LXM family):
        • allow spawn a new generator using existing one that produce statistically independent results
        • implemented by LXM algorithms (like L32X64MixRandom, L32X64StarStarRandom, L64X128MixRandom, L64X128StarStarRandom and others with different bitsizes)
      • jumpable:
        • allow the client to jump ahead a moderate number of draws
        • implemented by Xoroshiro128PlusPlus and Xoshiro256PlusPlus
    • we can use RandomGeneratorFactory to create the generators passing the algorithm name (like L32X64MixRandom or Xoroshiro128PlusPlus)
    • new types:
      • SplittableGenerator
      • JumpableGenerator
      • LeapableGenerator: allow the client to jump head a large number of draws;
      • ArbitrarilyJumpableGenerator: extends LeapableRandomGenerator and allow to jump arbitrary numbero of draws.
    • more detailed info in the docs

JVM

  • Strongly encapsulate JDK internals
    • make illegal access internal API flag obsolate (was --illegal-access=deny in Java 16)
    • only sun.misc and sun.reflect will be allowed to be access through jdk.unsupported module
  • Disable SHA-1 XML Signatures
    • can be enable with jdk.xml.dsig.secureValidationPolicy

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