Value Objects - The Next Big Thing in Java
summary
Explains that Project Valhalla brings value classes that behave like primitives but support methods and interfaces, showing memory math: a Point object costs ~24 bytes versus two primitive ints at 8 bytes and a Valhalla-inlined Point around 8–12 bytes, claiming up to ~50% memory savings in examples with 10 points. Covers JEPs 181, 309, 334, 390, drafts 401 and 402 for null-restricted types and enhanced primitive boxing, demos via the Valhalla OpenJDK build and online JShell sandbox, prototypes work but final semantics and release timing remain unresolved.
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chapters (11)
- 0:00Introduction
- 2:58Project Valhalla goals
- 7:00Primitives vs. objects
- 9:50Memory consumption analysis
- 18:16Understanding value objects
- 20:42Value objects benefits
- 25:13Null-restricted types
- 31:49Null-restricted value types
- 33:20Enhanced primitive boxing
- 36:51Summary and future outlook
- 43:04Resources and conclusion
