Is the order of values retrieved from a HashMap the insertion order

Question

I am trying figure out the order in which the values in a HashMap are/can be retrieved. Heres the code snippet for the same.

import java.util.HashMap;

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Answer 1

From the Javadoc: HashMap "class makes no guarantees as to the order of the map; in particular, it does not guarantee that the order will remain constant over time."

If you need consistent ordering, you can use LinkedHashMap (for insertion/access order), or TreeMap (for comparision order). Please note, that these maintain the order of the keys, not the values.