Kotlin: An interoperability story

Transcript

1. Kotlin:
 An interoperability story Yan Zhulanow, JetBrains Nov 2018
2. Good Java interoperability
 from the very beginning
3. Good Java interoperability
 from the very beginning Because we needed it
 for our projects
4. Compiles to JVM bytecode equals? Good Java interoperability
5. Compiles to JVM bytecode equals? Good Java interoperability NO.
6. String? Nullable types
7. val name: String = null
8. val name: String = null Null can not be a value of a non-null type String
9. val name: String? = null name.length
10. val name: String? = null name.length Only safe (?.) or non-null asserted (!!.) calls are allowed
11. System.getProperty("my.property") String String? What about Java?
12. System.getProperty("my.property") String? What about Java?
13. class DetailsActivity : FragmentActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setOrientation( getResources()!! .getConfiguration()!! .getOrientation()!!) getSupportFragmentManager()!! .beginTransaction()!! .add(android.R.id.content, DetailsFragment())!! .commit() } }
14. String! Platform types
15. Interoperable with Java
16. Interoperable with Java Ecosystem
17. Interoperable with Java Ecosystem Build tools Post-processors Analyzers Frameworks IDE
18. class Worker { @field:Inject var log: Logger? = null fun process(task: Task) { log?.debug("$task started") task.run() log?.debug("$task ended") } }
19. class Worker { @field:Inject var log: Logger? = null fun process(task: Task) { log?.debug("$task started") task.run() log?.debug("$task ended") } }
20. class Worker { @field:Inject lateinit var log: Logger fun process(task: Task) { log.debug("$task started") task.run() log.debug("$task ended") } }
21. @field:Inject Annotations with use-site targets
22. allopen noarg sam-with-receiver Compiler plugins
23. Inspections Java AST
24. UAST
 (universal AST) Java AST Kotlin AST Inspections
25. Interoperable with Java
26. Interoperable with Java Android
27. Tiny runtime around 1 MB
28. Dalvik/ART support
29. Tooling support Build tools, Lint, Android Extensions
30. Annotation processor support Dagger, ButterKnife, the rest 9000 of them
31. Kotlin 1.3
 Multi-platform projects!
32. Java Android Interoperable with
33. Java Android JavaScript Interoperable with
34. Java Android JavaScript C Interoperable with
35. Java Android JavaScript C
 Objective-C Interoperable with
36. Java Android JavaScript C
 Objective-C Swift Interoperable with
37. Java Android JavaScript C
 Objective-C Swift ??? Interoperable with
38. Java Android JavaScript C
 Objective-C Swift ??? Interoperable with ecosystem
39. We ❤ Kotlin. And we want to use it everywhere. because
40. We ❤ Kotlin. And we want to use it everywhere. because Back-end Front-end Android iOS Embedded Games Scripting ICPC Desktop Science
41. https://kotlinlang.org/
42. https://play.kotlinlang.org/
44. Thanks! ❤