Why is there no method to get an element by index in the HashSet collection implementation, as it is in a list?

HashSet in Java is implemented based on a hash table, where elements are unordered and do not have a fixed index. Therefore, the method of retrieving an element by index is absent, unlike a list, where elements are stored in a specific order and accessible by position.

Main reasons:

• Lack of order: HashSet does not guarantee the order of elements, so index makes no sense.
• Fast access by value: HashSet is optimized for quick search, addition, and removal of elements by their hash, not by position.

If index-based access is needed, consider using List or LinkedHashSet, which preserves insertion order.