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General maximum function in Java

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

I understand why <T extends Comparable<? super T>> <T extends Comparable<? super T>> makes sense. But I'm not sure why the argument is List<? extends T> coll List<? extends T> coll important.

Why is List<T> coll insufficient?

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Source: https://habr.com/ru/post/1273053/

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