Does the HashMap data structure have a predictable order of elements?

The data structure HashMap in Java does not guarantee a predictable order of elements. The order of storing and traversing elements depends on the hash function of the keys and the internal structure, which can change when elements are added or removed.

If a predictable order is needed, you can use:

• LinkedHashMap — preserves the insertion order of elements.
• TreeMap — stores elements in a sorted order by key.

Thus, a regular HashMap does not provide a stable order of elements during iteration.