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

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What does List<?> mean?

  1. A list of Objects

  2. A raw list type

  3. A non-raw list of a specific unknown type

  4. A list without any type

The correct answer is: A non-raw list of a specific unknown type

A) A list of Objects is not the same as a list of a specific unknown type. A list of Objects allows for any type of Object to be added to the list, while List<?> only allows for a specific unknown type to be added. B) A raw list type is not the same as List<?>. A raw list type does not have the type specified, whereas List<?> has a specific unknown type specified. D) A list without any type is not the same as List<?>. List<?> denotes a specific unknown type, whereas a list without any type can have any type of Object added to it. List<?> denotes a non-raw list of a specific unknown type. This means that the type of objects in the list is unknown, but the list itself is not a raw type. This allows for type safety while still being able to work with different types of objects

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