How does Java HashMap store entries internally?

HashMap maintains a table of entries, with references to the associated keys and values, organized according to their hash code. If you mutate a key, then the hash code will change, but the entry in HashMap is still placed in the hash table according to the original hash code. That's why map.

Get(keyOriginal) will return null.

If you change the entry but not the hashCode, you are safe. For this reason it is considered best practice to make all fields in the hashCode, equals and compareTo, both final and immutable.

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