Quiz for HashSet vs TreeSet

Q1: Which collection maintains elements in sorted order?

A. HashSet B. TreeSet C. ArrayList D. LinkedList

Q2: Which has better performance for add, remove, and contains operations?

A. TreeSet B. HashSet C. LinkedHashSet D. PriorityQueue

Q3: Which one allows null elements?

A. HashSet B. TreeSet C. Both D. Neither

Q4: What is the time complexity of adding an element in HashSet?

A. O(1) B. O(log n) C. O(n) D. O(n log n)

Q5: What is the time complexity of adding an element in TreeSet?

A. O(1) B. O(log n) C. O(n) D. O(n log n)

Q6: Which collection requires elements to be Comparable or a Comparator to be provided?

A. HashSet B. TreeSet C. LinkedList D. HashMap

Q7: Which class is faster when order of elements is not important?

A. TreeSet B. HashSet C. ArrayList D. LinkedHashSet

Q8: Which class automatically removes duplicates?

A. ArrayList B. TreeSet C. HashMap D. Queue

Q9: Which class maintains insertion order?

A. TreeSet B. HashSet C. LinkedHashSet D. PriorityQueue

Q10: Which is implemented using a Red-Black Tree?

A. HashSet B. TreeSet C. HashMap D. ArrayList