Mastering Java: The Ultimate Quiz for 'Thinking in Java'

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What is true about List and List<?> in Java generics?

  1. They are completely the same

  2. List is raw type and List<?> is a wildcard type

  3. List<?> is raw type and List is a wildcard type

  4. They are unrelated types

The correct answer is: List is raw type and List<?> is a wildcard type

List and List<?> are both generic types in Java, however they are not entirely the same. Option A is incorrect because they do have some differences. Option C is incorrect because the wildcard symbol <?> indicates an unspecified type, therefore it cannot be a raw type. Option D is incorrect because both List and List<?> are related as they are both generic types. The correct explanation is that List is known as a raw type since it does not have any generic type arguments specified, while List<?> is a wildcard type which can represent any generic type.

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