Mastering Java 2025 – 400 Free Practice Questions to Pass the 'Thinking in Java' Exam

Question: 1 / 510

What allows List<? super Apple> to safely add an Apple object?

It specifies the list must accept Apple as a lower bound

It guarantees the list contains only Apple objects

It allows any type as long as it's a base type of Apple

Generics in Java use the term "super" to represent a lower bound. In this context, "? super Apple" means that the list can accept any type that is a superclass of Apple. So, option C is correct because it allows for any type as long as it is a base type of Apple. Option A is incorrect because it specifies a lower bound, not an upper bound. Option B is incorrect because it guarantees only that the list contains Apple objects, not necessarily that only Apple objects can be added. Option D is incorrect because it does not automatically cast added objects to Apple.

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It automatically casts added objects to Apple

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