Difference between <?> and <L>
I'm making a listener system, and I was wondering what the difference between and
Is either one better than the other, and if so, which?
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Unknown User•2y ago
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Why not? lol
Unknown User•2y ago
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public void register(Class<? extends Listener> listener) implies any class that extends Listener can work.
public void register(Class<L extends Listener> listener) implies the class this resides in has <L extends Listener> as a generic argument.so the second doenst even compile
Ok welp
Ty
Unknown User•2y ago
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It's also just better to use
public void register(Listener listener), since you don't care about anything but the fact it extends the class.Unknown User•2y ago
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Oh, that sucks
Unknown User•2y ago
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:shrugging: I avoid generic likes the plague
Unknown User•2y ago
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People like to get too clever with them, causes problems.
Unknown User•2y ago
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Regardless, the best version of the function is
public void register(Listener listener).Unknown User•2y ago
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The issue here is that I also need this to work as an list
Unknown User•2y ago
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So i cant just use Listener<listener>
as a list
it wont work for my purposes
Unknown User•2y ago
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myList.stream().map(other::register);Why can't I use
ok
Unknown User•2y ago
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Where
List<? extends Listener>he said u can't use it to fix
Unknown User•2y ago
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oh
ok well ty
Unknown User•2y ago
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