Quiz for HashMap vs TreeMap

Q1: Which class maintains the natural ordering of keys?

A. HashMap B. TreeMap C. LinkedHashMap D. Hashtable

Q2: Which class allows one null key?

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

Q3: Which collection uses a Red-Black Tree internally?

A. HashMap B. TreeMap C. Hashtable D. ArrayList

Q4: Which class provides constant-time performance for get and put?

A. TreeMap B. HashMap C. LinkedHashMap D. TreeSet

Q5: Which collection guarantees log(n) time complexity for insertions?

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

Q6: Which collection is best suited when ordering of keys is not important?

A. TreeMap B. HashMap C. TreeSet D. PriorityQueue

Q7: Which class implements the NavigableMap interface?

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

Q8: Which map can accept null values?

A. TreeMap only B. HashMap only C. Both D. Neither

Q9: Which class is faster for frequent insertions and deletions?

A. TreeMap B. HashMap C. PriorityQueue D. TreeSet

Q10: Which class provides methods like lowerKey(), higherKey(), and ceilingKey()?

A. HashMap B. TreeMap C. Hashtable D. HashSet