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Editorial Team
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Asked: 2026-06-04T15:45:31+00:00

Can anyone explain how this both can compile and how it works? List<? super

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Can anyone explain how this both can compile and how it works?

List<? super String> list = new ArrayList<Object>();

As I understood it, the implementation of this needs to be either a String list or a list of objects that have String as super class? Have I missed something?

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1 Answer

  1. Editorial Team

    No (i.e. yes, you have missed something 🙂 . <? super String> is any class which is a superclass of String (including String itself). (In this case, the only other suitable class is Object.)

    What you described would be <? extends String> (which in this specific case wouldn’t be very useful as String is final, so it can have no subclasses).

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