#java-27

6 post(s)

Primitive Types in Patterns:instanceof and switch Without the Wrapper Dance

Try JEP 532 in JDK 27: use primitive patterns with instanceof, switch directly on long, float, double, and boolean, and reject lossy conversions without hand-written casts.

Java

Lazy Constants:Initialize Once Without the Double-Checked Lock

Try JEP 531 in JDK 27: LazyConstant.of, List/Map/Set.ofLazy, and one-time thread-safe init the JIT can constant-fold — without double-checked locking.

Java

PEM Encodings:Keys and Certs Without the Internal Parser

What the Java 27 PEM API is (JEP 538): encode and decode keys, certificates, and CRLs with PEMEncoder and PEMDecoder — no BouncyCastle, no sun.security.util.

Java

Post-Quantum TLS:Hybrid Key Exchange Before the Quantum Deadline

What Java 27 JEP 527 is: hybrid ML-KEM + ECDHE named groups in TLS 1.3 so JSSE sessions survive store-now-decrypt-later — without writing crypto.

Java

Compact Object Headers:Cut Header Size Without Changing a Line of Code

What JEP 519 compact object headers are: shrink 64-bit HotSpot headers from 12–16 bytes to 8 without changing application source, how to enable the flag on 24/25, and why Java 27 turns it on by default.

Java

Structured Concurrency:Treat Related Tasks as One Unit of Work

Learn the JDK 27 StructuredTaskScope factory API, Joiner policies, fan-in, sibling cancellation, and how structured concurrency fits virtual threads and scoped values.