what s the difference between `interface Stack lt T Any gt ` and `interface Stack lt T gt ` `T` already means literally anything

true if you go to implement this interface with a class that has type just `T` feeding that `T` back to Stack lt T gt will complain

not sure I understand what you mean sorry confused

means I tried it it s as you said thumbsup skin tone 2

okay good So the compiler prevents you from declaring a `Stack lt Int gt ` if you used the first definition right

what s the difference between `interface Stack lt T Any gt ` kotlinlang #getting-started

07/06/2021, 9:04 AM

what’s the difference between

interface Stack<T : Any>

interface Stack<T>

already means literally anything

07/06/2021, 9:08 AM

by default T implies

T : Any?

so includes nullable types. Your first declaration excludes nullable types from the domain.

07/06/2021, 9:10 AM

I see, nice ok

true, if you go to implement this interface with a class that has type just

, feeding that

back to Stack<T> will complain

07/06/2021, 9:20 AM

not sure I understand what you mean, sorry 😕

07/06/2021, 9:20 AM

means I tried it, it’s as you said 👍🏻

07/06/2021, 9:23 AM

okay good! So the compiler prevents you from declaring a

Stack<Int?>

if you used the first definition, right?

07/06/2021, 9:25 AM