Kotlin: Gradle で Kotlin Sealization を使う

こちらのプログラムを改造しました。
Kotlin: Gradle で使う

プログラム

app/src/main/kotlin/ex04/App.kt

// ------------------------------------------------------------------
/*
	app/src/main/kotlin/ex04/App.kt

					Oct/17/2023
*/
// ------------------------------------------------------------------
package ex04

import java.time.LocalDate
import java.time.LocalDateTime
import java.time.format.DateTimeFormatter

import kotlinx.serialization.*
import kotlinx.serialization.json.*

// ------------------------------------------------------------------
class App {
    val greeting: String
        get() {
            return "本日は晴天なり!"
        }
}

fun main() {
	println(" *** 開始 ***")
	println(LocalDate.now())
	println(LocalDateTime.now())
	println(App().greeting)

	@Serializable
	data class Data(
		val key: String,
		val name: String,
		val population:Int,
		val date_mod: String)

	val date1: String = "2022-11-04"
 
	val datax = Data("t0921","宇都宮",92145,date1)

        val json = Json.encodeToString(serializer<Data>(), datax)
        println(json)

	println(" *** 終了 ***")
}

// ------------------------------------------------------------------

設定ファイル

app/build.gradle.kts

/*
 * This file was generated by the Gradle 'init' task.
 *
 * This generated file contains a sample Kotlin application project to get you started.
 * For more details take a look at the 'Building Java & JVM projects' chapter in the Gradle
 * User Manual available at https://docs.gradle.org/7.2/userguide/building_java_projects.html
 */

plugins {
    // Apply the org.jetbrains.kotlin.jvm Plugin to add support for Kotlin.
    id("org.jetbrains.kotlin.jvm") version "1.9.0"
	id("org.jetbrains.kotlin.plugin.serialization") version "1.9.0"
    // Apply the application plugin to add support for building a CLI application in Java.
    application
}

repositories {
    // Use Maven Central for resolving dependencies.
    mavenCentral()
}

dependencies {
    // Align versions of all Kotlin components
    implementation(platform("org.jetbrains.kotlin:kotlin-bom"))

    // Use the Kotlin JDK 8 standard library.
    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")

    // This dependency is used by the application.
    implementation("com.google.guava:guava:30.1.1-jre")

 implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.5.0")

    // Use the Kotlin test library.
    testImplementation("org.jetbrains.kotlin:kotlin-test")

    // Use the Kotlin JUnit integration.
    testImplementation("org.jetbrains.kotlin:kotlin-test-junit")
}

application {
    // Define the main class for the application.
    mainClass.set("ex04.AppKt")
}

実行結果

> Task :app:run
 *** 開始 ***
2023-10-17
2023-10-17T15:22:29.999678881
本日は晴天なり!
{"key":"t0921","name":"宇都宮","population":92145,"date_mod":"2022-11-04"}
 *** 終了 ***

BUILD SUCCESSFUL in 655ms
2 actionable tasks: 1 executed, 1 up-to-date