5 Secret Java API Tricks and Record Semantics

Covers two topics from the Inside Java Newscast. First, five lesser-known Java API features: Pattern::asPredicate for filtering streams with regex, named capturing groups in regular expressions, Predicate::not for cleaner method references, Comparator::naturalOrder as a starting point for comparator chaining, and the AutoCloseable nature of streams (important when using Files::list or Files::lines). Second, clarifies the true semantics of Java records: they are not primarily about reducing boilerplate, but about representing nominal tuples where the API models the state, the whole state, and nothing but the state. Boilerplate reduction is a consequence of this design, not the goal. This distinction explains record restrictions and their suitability for pattern matching and serialization.