Shulou(Shulou.com)06/03 Report--

This article introduces the knowledge of "must extends inherit in Java?". In the operation of actual cases, many people will encounter such a dilemma. Next, let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Which keyword is used to represent inheritance in Java? Extends! Yes, this is common sense known to Java pupils. But does extends have any other meaning? Does it necessarily represent inheritance in any case? Not necessarily.

We know that the Collections class has a static method, sort, for sorting List, which requires that element classes in List must implement the Comparable interface. Let's look at the source code:

... @ SuppressWarnings ("unchecked") public static

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.