generic maximum function in Java

Asked Nov 01 '17 at 13:27

Active Nov 01 '17 at 14:31

Viewed 109 times

public static <T extends Comparable<? super T>> T max(List<? extends T> coll){
    // return max;
}

I see why <T extends Comparable<? super T>> makes a sense. But, I am not sure why an argument List<? extends T> coll is important.

Why List<T> coll is not sufficient?

edited Nov 01 '17 at 14:31

Zabuzard

asked Nov 01 '17 at 13:27

Gilgamesz

https://stackoverflow.com/questions/4343202/difference-between-super-t-and-extends-t-in-java will help you to understand the concept. – Jobanpreet Singh Nov 01 '17 at 13:32
1

Do those duplicates really answer this question? As for me (without having tested it either way), I tend to agree with OP in seeing no reason why `List` would not suffice in this case. – tobias_k Nov 01 '17 at 13:35
1

Where did you see this code? – Thilo Nov 01 '17 at 13:39
2

@Thilo It's not dissimilar to `Collections.max()` – assylias Nov 01 '17 at 13:48

0 Answers0