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

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Mastering Java: The Ultimate Quiz for 'Thinking in Java'. Dive deep into Java with multiple-choice questions. Challenge yourself with quiz questions designed to test and improve your understanding of the 'Thinking in Java' book. Get ready for your exam!

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Which collection type is not allowed to have duplicate elements?

List
Set
Queue
Map

The correct answer is: Set

Set is a collection type that is specifically designed to not allow duplicate elements. Lists are ordered collections that allow duplicates. Queues are similar to lists, but allow for the removal of elements from the front of the collection. Maps are key-value pair collections that can have duplicate values but not duplicate keys. Therefore, none of the other options are correct for a collection type that does not allow for duplicate elements.