Java 26 Primitive Types in Patterns — The Interview Trap (opens in new tab)

Java 26 ships JEP 530 — the fourth preview of primitive types in patterns — and with it comes one of the sneakiest interview topics in modern Java. You can now write instanceof int, instanceof byte, and switch on long or double directly. Seniors who have not read the JEP carefully assume this is trivial. It is not. The exactness model, the boxing …