HashCode() and equals()

Question

Whats the sense of both?
Why do i need a hashcode methode if i overwrite equals?
isnt it kinda the same?

Answer 1

Although they may produce the same or similar results in some cases, they are not the same. They do however have a tight bond and are relational. The hashCode() method represents the identity of the current instance of an object, while the equals() method typically represents the equality between 2 object instances where the hashCode may be used for comparison.

Here's some more info:
https://www.baeldung.com/java-equals-hashcode-contracts

https://www.journaldev.com/21095/java-equals-hashcode

https://www.google.com/amp/s/www.geeksforgeeks.org/equals-hashcode-methods-java/amp/