Polishing the Diamond: Core Library Improvements in Java 9
summary
Live-coded demos use the JShell REPL to show concrete Java 9 improvements that simplify real code: collection factory methods produce truly immutable lists and sets and Map.of overloads up to 10 (with Map.entry varargs for more pairs), Stream.ofNullable plus takeWhile/dropWhile and the iterate overload stop infinite streams by value, new collectors filtering and flatMapping preserve grouping semantics, and Optional gains stream(), ifPresentOrElse and or to compose lookups. Sample code runs on iteratrlearning / GitHub and examples execute as shown.
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chapters (13)
- 0:00Introduction
- 1:41Expressions
- 2:00Table of Contents
- 2:49The Biggest Problem
- 4:15ArrayList
- 6:14Collections Factory
- 8:29MapFactory
- 18:11Limit Statement
- 22:09Collectors
- 27:33Tags
- 31:06Optionals
- 36:41IfPresent
- 40:19Optional API
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