Java 12 & 13 What's new and noteworthy?

on YouTube ↗02h 30m

" summary

Overview of concrete changes and how to use them: Java 12–13 add preview language features (must compile and run with matching --enable-preview and --release flags), a reworked socket layer, AppCDS that cuts cold-start time by ~100ms in demos, Files.mismatch for bytewise diffs, new CompletableFuture error handlers, and a teeing collector to run two collectors in one pass. Key user-facing features are switch expressions (yield in Java 13, exhaustive matching) and text blocks (""" literals with specific indentation rules). Shenandoah and ZGC aim for tiny pauses (demo: Shenandoah ~1ms longest pause vs G1 ~150ms, CMS ~1s).

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" chapters (44)

1. 0:00Start
2. 3:16Agenda for Today
3. 10:01Support Cliff
4. 11:43Byte Code Compatibility
5. 12:32Compact Strings
6. 16:41Release Notes
7. 17:09Preview Features
8. 20:03Java 12
9. 28:22Difference between Statement and Expression
10. 28:51The if Statement in Java
11. 29:07Ternary Operator
12. 30:18Switch Expressions with Break Keyword in Java 12
13. 32:12Yield
14. 32:59Lambdas Style
15. 34:25Lambda Style
16. 35:03Blocks
17. 44:37Text Blocks
18. 48:52Closing and Escaping
19. 54:42Escaping Words
20. 58:24Translate Escapes
21. 1:01:55Need for Compact Number Formatting
22. 1:05:01Team Collector
23. 1:18:14Files Mismatch
24. 1:19:41Files Mismatch Demo
25. 1:27:47Socket Api Got Re-Implemented in Java 13
26. 1:28:25Nio Socket Implementation
27. 1:30:58Garbage Collectors
28. 1:31:10Default Garbage Collector
29. 1:32:28Cache Invalidation
30. 1:42:41Zgc
31. 1:43:14Soft Max Heap Size
32. 1:45:01The Garbage Collector
33. 1:47:47Gc Quasi Benchmark
34. 1:48:11Quasi Benchmark
35. 1:48:37The Epsilon Garbage Collector
36. 1:50:10Flight Recorder
37. 1:52:51Concurrent Mark-Sweep
38. 1:54:24Java Mission Control
39. 1:55:05Garbage Collections
40. 1:56:35Concurrent Garbage Collector
41. 1:58:22Constants App Api
42. 1:58:46Application Class Data Sharing
43. 2:06:09User Time Zone
44. 2:08:59Changes in Nios Byte Buffer in Java 13

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