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kotlinlang

Im curious about `?` and `!!` operators. Let's say I have a fun that should be fired on a service that show/hide something, like: bubblesService.addBubble(), but the service itself is nullable. `bubblesService: BubblesService? = null`. At some point im sure it is not null, and on the next line after `bubblesService = binder.service` I want to call `bubblesService.addBubble()`. Even tho I theoriticaly know its not null, I dont want to call it on a null referencje object. So I can say bubblesService!!.addBubble(), since I know its not null. But I can also call bubblesService?.addBubble() and do the same, but In case if (for any reason) it is null I wont crash, using `?`. So, I don't see any advantage of using `!!` if I can simply use `?` and dont run the code that could otherwise crash the app