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From javadoc we know:Class Object is the root of the class hierarchy. Every class has Object as a superclass. All objects, including arrays, implement the methods of this class.The List<? super Object> means what?

TongChen
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  • [Mightbe Helpful](https://stackoverflow.com/questions/4343202/difference-between-super-t-and-extends-t-in-java) – Dinesh K Oct 11 '19 at 09:21
  • https://stackoverflow.com/questions/4343202/difference-between-super-t-and-extends-t-in-java check this, it explains what you are asking – jpganz18 Oct 11 '19 at 09:24
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    Logically `List super Object>` must mean the same as `List` (if it also behaves the same in all situation I don’t guarantee immediately). – Ole V.V. Oct 11 '19 at 09:27
  • @jpganz18 thank you,the question contains more details. – TongChen Oct 14 '19 at 02:09

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