Reduces pause times by performing evacuation work concurrently. Hidden Classes
A new platform-independent implementation of the EdDSA signature scheme. Higher security and performance. Found in the java.security package. 🛠️ JVM and Tooling Improvements ZGC and Shenandoah (Finalized) JDK 15: The new features in Java 15
Classes that cannot be used directly by the bytecode of other classes. Intended for frameworks that generate classes at runtime. Improved security and reduced memory footprint. Foreign-Memory Access API (Second Incubator) Found in the java
Sealed classes and interfaces restrict which other classes may extend or implement them. Provides better control over inheritance. Useful for domain modeling and pattern matching. Syntax: public sealed class Shape permits Circle, Square {} Text Blocks (Finalized) Multiline string literals are now standard. Eliminates the need for most escape sequences. Automatically manages indentation. Uses triple quotes: """ ... """ . EdDSA (Edwards-Curve Digital Signature Algorithm) Improved security and reduced memory footprint
These features graduated from "preview" or "experimental" status to being permanent parts of the language. Sealed Classes (First Preview)
Both low-latency Garbage Collectors are now production-ready. Scalable, low-latency (sub-millisecond) GC.