Kotlin data Class

Giriş

Üye alanlar için getter(), setter(), equals(), hashCode() ve copy() metodları üretir. Açıklaması şöyle

1. data class cannot be abstract, inner, open or sealed.

2. At least 1 parameter is required in the primary constructor.

3. data class does not implement Serializable by default.

4. data class can implement interfaces and extend other classes (since v1.1).

Örnek

Şöyle yaparız

enum class RequestType {CREATE, DELETE}
data class RuleChange(val organizationId: String, val userIds: List<String>,
  val request: RequestType)

Örnek

Açıklaması şöyle

If we want to exclude any property from being included in the automatically generated functions, we can put the property in the class body :

Only genre and artist properties will be used in the implementation of hashcode(), equal(), copy(), toString() method.

Şöyle yaparız

data class Song(val genre: String, val artist: String){
  var title: String;
}
val songA: Song = Song("Pop", "Jamie")
val songB: Song = Song("Pop", "Jamie")
songA.title = "Take the train"
songB.title = "All blues"
songA.equals(songB) // true

copy

Şöyle yaparız

val song: Song = Song("Jazz", "John")
val anotherSong: Song = song.copy()

print(song == anotherSong) // true
print(song === anotherSong) // false

val nextSong: Song = song.copy(artist = "Judy")