Ace Java 2026: Rock Your 'Thinking in Java' Challenge!

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What can be inferred about a generic type using wildcards in its declaration?

Its exact runtime type

The range of types it can operate on

Using wildcards in a generic type declaration allows for a wider range of types to be used with the generic type, rather than being bound to a specific type. This means that the generic type can operate on a larger range of types, making option B the most accurate inference. Option A is incorrect because wildcards do not reveal the exact runtime type, only that it can accept a wider range of types. Option C is incorrect because wildcards do not necessarily allow for multiple types in a single instance, as that would violate the principle of type safety. Option D is incorrect because wildcards do not determine the specific methods that a generic type implements, only the range of types it can operate on.

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That it can contain multiple types simultaneously

The specific methods it implements

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