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Editorial Team
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Asked: 2026-06-14T12:10:01+00:00

Why does the first line work but not the second: Class<? extends Class> c1

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Why does the first line work but not the second:

Class<? extends Class> c1                  = (new Object()).getClass().getClass();
Class<? extends Class<? extends Class>> c2 = (new Object()).getClass().getClass().getClass();
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1 Answer

  1. Editorial Team

    From the API docs for Object.getClass

    The actual result type is Class where |X| is the erasure of the static type of the expression on which getClass is called.

    So (new Object()).getClass() will return a Class<? extends Object>. We’re going to call getClass on that. So the X will be Class, which will give us Class<? extends Class>.

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