What's New in Java 19: The end of Kotlin?
summary
Claim: Java rapidly adds real features that overlap Kotlin but with different tradeoffs. Examples and timelines are given: records (Java 14–16 preview to stable) mirror data classes but use invokedynamic for smaller bytecode, nested functions get hoisted to static helpers, and multi line strings plus optimized invokedynamic string concat optimization reduce allocations. Project Loom brings virtual threads (Loom timeline uncertain) that convert blocking APIs to suspendable behavior. Kotlin keeps advantages: nullability in the type system, multiplatform and IDE migration paths, and the copy/destructuring ergonomics.
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chapters (17)
- 0:00Intro
- 0:27History of Java
- 3:59Type inference
- 10:37Multiline strings
- 22:39Sealing
- 25:56Smartcast
- 29:07Deconstruct
- 30:31Deconstruct bytecode
- 35:49Second constructor
- 36:53Pattern matching
- 37:44When
- 39:24Scope
- 40:13Sealed Hierarchies
- 44:34Kotlin vs Java
- 45:07Coroutines
- 46:40The end of Kotlin
- 47:21Kotlin is evolving
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