List is an ordered sequence of elements whereas Set is a distinct list of elements which is unordered.
| Point of Distinction | List | Set |
|---|---|---|
| Positional Access | Yes | No |
| Duplicates | Yes |
No. If you try yo insert the duplicate element in Set it would replace the existing value. |
| Order | Ordered. Insertion order is maintained. | Depends upon implementation. LInkedHashSet maintains the elements in insertion order. |
| Null Value | Any number of null values | One null value in its collection. |
| Method inside Interface | New methods are defined inside List interface. | No new methods are defined inside Set interface. |
| Forward or Backward insertion | Both direction using Listiterator. | Forward direction with the help of iterator. |
| Use | To store non-unique ordered elements in as per insertion order. | To store unique non-ordered elements. |
| Implementation | ArrayList, LinkedList etc. | HashSet LinkedHashSet, TreeSet etc. |
| Legacy Class | Vector | None |
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