The document introduces Kotlin, an Android development language that can be used in Android Studio. It provides instructions on installing Kotlin in Android Studio and converting Java files to Kotlin. It then discusses what Kotlin is, why it should be used, basic syntax features, common idioms, and the standard library API.

1. Kotlin
2016. 02. 27.

2. February 15, 2016

3. Kotlin - Android Studio

4. Kotlin - Android Studio
• Android Studio 에서 Kotlin 언어로 개발 환경 방법
• Android Studio Plugins 에서 “Kotlin” 검색 후 설치
• New Project -> “Code ->Convert Java file to Kotlin
file”
• Gradle 설정 -> Sync
• Run

5. New Project

6. Convert
• Menu ->
• Code ->
• Convert Java File to Kotlin FIle

7. Gradle 설정
• Menu ->
• Tool ->
• Kotlin ->
• Configure Kotlin in Project

8. Run - END

9. What Kotlin?

10. What Kotlin?
• Kotlin is a pragmatic programming language for
JVM and Android that combines OO and functional
features and is focused on interoperability, safety,
clarity and tooling support.
link to “Kotlin 1.0”

11. Why Kotlin?

12. Why Kotlin?
• Concise
• Safe (NullPointerExceptions)
• Versatile (Android, Application Server, JavaScript,
JAVE EE, HTML)
• Interoperable (JVM or JavaScript)

13. Basic Syntax

14. Basic Syntax
• https://kotlinlang.org/docs/reference/basic-
syntax.html

15. Basic Syntax
• Using string templates

16. Basic Syntax
• Using unlovable values and checking for “null”

17. Basic Syntax
• Using type checks and automatic casts
or

18. Basic Syntax
• Using when expression

19. Basic Syntax
• Using ranges

20. Basic Syntax
• Using collections

21. Idioms

22. Idioms
• Creating DTO’s
• Default values for function parameters
• Filtering a list
• String Interpolation
• Instance Checks
• Traversing a map/list of pairs
• Read-only list, map
• Lazy property
• Extension Functions
• Creating a singleton
• …..

23. Idioms
• Creating DTO’s (POJO’s/POCO’s)
- getters (and setters in case of var’s) for all properties
- equals()
- hashCode()
- toString()
- copy()
- component1(),….

24. Idioms
• Filtering a list

25. Idioms
• String Interpolation

26. Idioms
• Traversing a map/list of pairs

27. Idioms
• Read-only list / map
• Accessing a map

28. Idioms
• Lazy property

29. Idioms
• Extension Functions

30. Idioms
• Extension Functions

31. Idioms
• Creating a singleton

32. Idioms
• If not null
// null

33. Idioms
• If not null and else shorthand

34. Idioms
• Execute if not null

35. Idioms
• ‘if’ expression

36. Idioms
• Calling multiple methods on an object instance (‘with’)

37. Kotlin Standard Library
API

38. Kotlin Standard Library
• let
• with
• run
• apply

39. let
• Execute if not null

40. let

41. with

42. run

43. apply

44. https://kotlinlang.org
https://kotlinlang.org/api/latest/jvm/stdlib/#
http://blog.jetbrains.com/kotlin/
http://qiita.com/ngsw_taro/items/
d29e3080d9fc8a38691e