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

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for your Java exam with our ultimate quiz based on 'Thinking in Java'. Engage with expertly crafted questions that enhance your learning process. Perfect for Java enthusiasts looking to solidify their knowledge!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

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.