#pattern-matching

3 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

Unnamed Variables and Patterns:Ignore What You Do Not Need With `_`

Learn where Java 22 lets you use underscore for intentionally unused locals, catch parameters, lambda parameters, type patterns, and nested record patterns.

Java

Sealed Classes + Pattern Switch:Exhaustive Code Without `instanceof` Soup

What sealed classes are (JEP 409 / Java 17), how pattern switch and record patterns finish the story on Java 21, and how to replace cascading instanceof with compiler-checked exhaustiveness.