Kotlin - data class

 

If you declare a value of variable in constructor, you don't need add parameter when you create class.

class KotlinPlayGroundActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_kotlin_play_ground)

        val person = Person("jinhan")
        println("person name : ${person.name}, registered : ${person.registered}")

    }

    data class Person(val name: String, val registered: Instant = Instant.now())
}