Java 23 - Better Language, Better APIs, Better Runtime by Nicolai Parlog

Java 23 introduces simplified main method syntax, removing the need for void, String[] args, and class wrapper

Project Valhalla brings value types and primitive patterns, allowing better memory mapping and optimization of primitive types

The Foreign Function & Memory API provides safe access to off-heap memory and better integration with native code, replacing unsafe memory operations

New Markdown-based Javadoc comments introduced with triple slash (///), offering better documentation formatting and readability

Module imports provide simplified package access with import module java.xml syntax, reducing verbosity of individual package imports

Stream Gatherers API adds new intermediate operations for stream processing with stateful operations and custom collectors

Generational ZGC is now the default garbage collector mode, offering better performance with very low pause times

Constructor chaining improvements enforce initialization order and prevent accessing uninitialized fields

Pattern matching enhancements for primitives and records, with better type checking and deconstruction

Security Manager and finalization are being phased out, with alternatives recommended for resource management