Data-oriented programming in Java

on YouTube ↗47m

" summary

Shows that Java can be used for data‑oriented programming by converting a timesheet app into immutable records for payloads, using sealed classes to model exact/no/multiple search results, and applying pattern matching plus switch expressions and record deconstruction to drive flow without mutating objects. Demonstrates validation → store flows, compiler‑enforced exhaustiveness, and safer concurrency. Notes when features landed (records ~Java 14/15, pattern matching and sealed support later; recommends moving to Java 21 LTS to get the full set).

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" chapters (15)

1. 0:00Introduction to talk
2. 1:11About the speaker
3. 1:56Agenda overview
4. 2:40Evolution of Java apps
5. 7:22Data-oriented programming principles
6. 14:24Java support for DOP
7. 15:09Java records explained
8. 18:03Sealed classes in Java
9. 21:14Pattern matching basics
10. 26:22Advanced pattern matching
11. 32:46Combining Java and DOP
12. 33:07Optional sealed interface example
13. 35:12Real-world REST example
14. 39:26Summary of DOP in Java
15. 40:09Q&A session

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