How do HashSet and TreeSet handle duplicates in Java?

Can you explain how HashSet and TreeSet handle duplicates in Java?

Sure! In Java, HashSet does not allow duplicates. If you try to add a duplicate element, it simply ignores it. On the other hand, TreeSet also does not allow duplicates, but it maintains the elements in a sorted order.

What happens if I try to add a duplicate to a HashSet?

If you attempt to add a duplicate to a HashSet, the add method will return false, indicating that the element was not added because it already exists.

Is there a difference in performance between HashSet and TreeSet?

Yes, HashSet generally offers constant time performance for basic operations like add, remove, and contains, while TreeSet has a logarithmic time complexity due to its underlying red-black tree structure.

Can I store null values in both HashSet and TreeSet?

Yes, you can store null values in HashSet, but TreeSet does not allow null values if it uses a comparator that does not support null.