How to override equals() and hashCode() method in Java

As a side note, when we override equals(), it is recommended to also override the hashCode() method . If we don’t do so, equal objects may get different hash-values; and hash based collections, including HashMap, HashSet, and Hashtable do not work properly (see this for more details).29 Tem 2021

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if you override equals, you must override hashCode. hashCode must generate equal values for equal objects. equals and hashCode must depend on the same set of significant fields . You must use the same set of fields in both of these methods .31 Ara 2021

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