Java 21 (LTS)
Virtual Threads (JEP 444): Lightweight threads allowing millions per JVM. Pattern Matching for switch (JEP 441): switch expressions with type patterns and guards. Record Patterns (JEP 440): Destructuring Record types in pattern matching. String Templates (Preview).
Java 22
Unnamed Variables (JEP 456): Use underscore _ to ignore unneeded variables. Stream Gatherers (Preview): Custom intermediate operations extending Stream API. Foreign Function & Memory API becomes a standard feature.
Java 23
Scoped Values (Preview): A safer alternative to ThreadLocal for inter-thread data sharing. Structured Concurrency (Preview): Treating related concurrent tasks as a single unit of work, simplifying error handling and cancellation. Primitive Types in Patterns.
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