Preparing for the Java Cert and Learning New Features (Part 1)
summary
Covers concrete Java 9–17 cert material: var only for local variables with rules (must be initialized, not for fields, null allowed only with cast, cannot mix var with explicit types in one declaration), collections APIs like List.of immutable and Arrays.asList fixed-size, Map.of/Map.entry rules, stream additions (Stream.ofNullable, lines, chars, Stream.iterate(seed,pred,next), takeWhile/dropWhile) and module mechanics (module-info, requires/requires transitive, exports, opens, no circular dependencies, java.base visibility). Includes exam-style code questions and answers.
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