How to Modify a Key in a HashMap?

Date: 2023-09-11

Java HashMaps efficiently store key-value pairs using a hash table, offering fast data retrieval. While you can't directly alter keys (doing so can corrupt data), you can update key-value pairs by removing the old entry with remove() and adding a new one with put(). Keys should be immutable to maintain the HashMap's integrity. Using custom objects as keys requires implementing correct equals() and hashCode() methods. Properly handling key updates ensures reliable and consistent HashMap functionality.

Read more: https://examples.javacodegeeks.com/alter-keys-in-hashmap/