Lateinit.kt

class Activity {
  
  lateinit var notificationManager: NotificationManager
  
  override fun onCreate() {
    super.onCreate()
    
    // lateinit allows to access property without initialization and check for null
    // this will cause a crash
    notificationManager.readNotification()
    
    notificationManager = NotificationManager()
    
    // After initialization we can easily access it
    notificationManager.readNotification()
  }
}