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Java 17

Features​

Language​

  • JEP 409: Sealed Classes
    • 限制哪些其他类或接口可以扩展或实现它们。
  • JEP 406: Pattern Matching for switch (Preview)
  • JEP 306: Restore Always-Strict Floating-Point Semantics
    • 始终严格的浮点语义，strictfp 关键字不再需要。

Library​

  • JEP 356: Enhanced Pseudo-Random Number Generators
    • 提供新的 PRNG 接口和实现。
  • JEP 415: Context-Specific Deserialization Filters
  • JEP 414: Vector API (Second Incubator)
  • JEP 412: Foreign Function & Memory API (Incubator)

Platform & Tools​

  • JEP 403: Strongly Encapsulate JDK Internals
    • 强封装 JDK 内部 API，除了 sun.misc.Unsafe。
  • JEP 382: New macOS Rendering Pipeline
    • 使用 Apple Metal API。
  • JEP 391: macOS/AArch64 Port
    • 支持 Apple Silicon (M1/M2/etc)。

Removals & Deprecations​

  • JEP 411: Deprecate the Security Manager for Removal
  • JEP 398: Deprecate the Applet API for Removal
  • JEP 407: Remove RMI Activation
  • JEP 410: Remove the Experimental AOT and JIT Compiler

References​