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

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Want to excel in Java? Test your knowledge with our ultimate quiz based on 'Thinking in Java'. Engage with multiple-choice questions and in-depth explanations. Boost your understanding and prepare for your exam with confidence.

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Which collection class allows duplicate elements?

Set
List
Queue
Map

The correct answer is: List

A Set does not allow duplicate elements since it adheres to the "unique keys" concept. C: Queue does not allow duplicate elements since it follows a FIFO (First-In-First-Out) structure. D: Map can have duplicate values, but not duplicate keys. B: List is the correct answer because it allows for duplicate elements. This is because list data structures do not have any restrictions on the number of times an element can appear. Therefore, you can have duplicate elements in a list.