Kotlin Serialization は sealed class も対応していて便利

Kotlin Serialization

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1. plugins {  
2.     ...  
3.     id "org.jetbrains.kotlin.plugin.serialization" version "1.4.31"  
4. }  
5.   
6. dependencies {  
7.     ...  
8.     implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:1.1.0"  
9. }  

plugins { ... id "org.jetbrains.kotlin.plugin.serialization" version "1.4.31" } dependencies { ... implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:1.1.0" }

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1. @Serializable  
2. data class Dog(val name: String, val age: Int, val sex: Sex, val kind: Kind)  
3.   
4. enum class Sex {  
5.     MALE,  
6.     FEMALE  
7. }  
8.   
9. @Serializable  
10. sealed class Kind {  
11.   
12.     @Serializable  
13.     object Hybrid : Kind()  
14.   
15.     @Serializable  
16.     data class PureBlood(val name: String) : Kind()  
17. }  

@Serializable data class Dog(val name: String, val age: Int, val sex: Sex, val kind: Kind) enum class Sex { MALE, FEMALE } @Serializable sealed class Kind { @Serializable object Hybrid : Kind() @Serializable data class PureBlood(val name: String) : Kind() }

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1. class DogTest {  
2.   
3.     @Test  
4.     fun list() {  
5.         val dogs = listOf(  
6.             Dog("White", 10, Sex.MALE, Kind.Hybrid),  
7.             Dog("Black", 20, Sex.FEMALE, Kind.PureBlood("Husky"))  
8.         )  
9.   
10.         val json = Json.encodeToString(dogs)  
11.         println(json)  
12.         // [{"name":"White","age":10,"sex":"MALE","kind":{"type":"net.yanzm.serialize.Kind.Hybrid"}},{"name":"Black","age":20,"sex":"FEMALE","kind":{"type":"net.yanzm.serialize.Kind.PureBlood","name":"Husky"}}]  
13.   
14.   
15.         val decoded = Json.decodeFromString<List<Dog>>(json)  
16.   
17.         assertThat(decoded).isEqualTo(dogs)  
18.     }  
19. }  

class DogTest { @Test fun list() { val dogs = listOf( Dog("White", 10, Sex.MALE, Kind.Hybrid), Dog("Black", 20, Sex.FEMALE, Kind.PureBlood("Husky")) ) val json = Json.encodeToString(dogs) println(json) // [{"name":"White","age":10,"sex":"MALE","kind":{"type":"net.yanzm.serialize.Kind.Hybrid"}},{"name":"Black","age":20,"sex":"FEMALE","kind":{"type":"net.yanzm.serialize.Kind.PureBlood","name":"Husky"}}] val decoded = Json.decodeFromString<List<Dog>>(json) assertThat(decoded).isEqualTo(dogs) } }