What is difference between HashMap and HashSet | Eklavya Online

What is difference between HashMap and HashSet

HashSet : HashSet does not allow duplicate values. It provides add method rather put method. You also use its contain method to check whether the object is already available in HashSet. HashSet can be used where you want to maintain a unique list.

HashMap : It allows null for both key and value. It is unsynchronized. So come up with better performance.