Foggy day

Add open in front of class to extend class in kotlin. class KotlinPlayGroundActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_kotlin_play_ground) val people = People("jinhan", 30) println("name : ${people.name}, age : ${people.age}") } class People(name: String, age: Int) : Person(name, age) {..