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 maintains elements in the insertion order?

  1. HashSet

  2. LinkedHashMap

  3. TreeSet

  4. PriorityQueue

The correct answer is: LinkedHashMap

The other options, HashSet, TreeSet, and PriorityQueue, have no inherent order in which the elements are maintained. So, insertion order wouldn't be a factor in those collections. LinkedHashMap, on the other hand, implements the Map interface and uses a combination of a doubly-linked list and a hash table to maintain the entries in a predictable order based on the order of insertion. Therefore, elements are maintained in the insertion order in a LinkedHashMap.

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