The difference between HashMap and HashSet are following:-
| HashMap | HashSet |
| 1 HashMap is a implementation of Map interface. | 1 HashSet is an implementation of Set Interface. |
| 2 HashMap Stores data in form of key and pair. | 2 HashSet Store data in form of objects. |
| 3 To add elements put() methods is used. | 3 To add element add() methods is used. |
| 4 In HashMap hashcode value is calculated using key object. | 4 Member object is used for calculating hashcode value. Two object may have same hash code. |
| 5 HashMap is faster than hashSet because unique key is used to access object. | 5 HashSet is slower than HashMap. |