Java SE: Lambdas, Streams & Future Directions
summary
Covers concrete changes in Java SE 8: lambda expressions as anonymous functions tied to functional interfaces, implemented via invoke dynamic, and method/constructor references; default methods let interfaces gain new behaviors without breaking old binaries; Optional replaces null for empty results. The streams api provides lazy, composable pipelines (map/flatMap/filter/reduce), parallel execution via Spliterator + fork‑join, and collectors; examples include file line counts, unique-word sorting, and a working serial‑port temperature reader. Notes future work: Project Jigsaw, Sumatra, and value types.
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chapters (15)
- 0:00Introduction and legal disclaimer
- 0:55Why Java needs change
- 4:27Lambda expressions introduction
- 13:23Lambda expressions deep dive
- 25:47Streams API overview
- 32:48Default methods in interfaces
- 38:05Stream characteristics and lazy evaluation
- 44:46Optional class and terminal operations
- 50:46Practical stream examples
- 53:12Future directions in Java
- 58:30Conclusion and summary
- 1:00:39Q&A: Potential misuse of lambdas
- 1:01:21Q&A: Stream reuse limitations
- 1:03:50Q&A: Future expressiveness features
- 1:04:51Q&A: Lambda implementation details
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