[Android application] Object with Kotlin android

class MainActivity : AppCompatActivity() {

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

 var user = User("Kotlin", "Kotlin@yahoo.com") 

 var msg: String = "name:" + user.name + "\n" + user.email 

 var tv = findViewById(R.id.tv) as TextView 

 tv.text = msg

    }

    inner class User(var name: String, var email: String)
}