java - Why does ArrayList have "implements List"?

Question

(This question already has answers here): question from:https://stackoverflow.com/questions/4387419/why-does-arraylist-have-implements-list

Answer 1

Yes. It could've been omitted. But thus it is immediately visible that it is a List. Otherwise an extra click through the code / documentation would be required. I think that's the reason - clarity.

And to add what Joeri Hendrickx commented - it is for the purpose of showing that ArrayList implements List. AbstractList in the whole picture is just for convenience and to reduce code duplication between List implementations.