What is the use of defining equals , compareTo and hashcode methods in a class ? Where are they used ?
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 Q1. What is the use of defining equals , compareTo and hashcode methods in a class ? Where are they used ?Core Java
Ans. equals, compareTo and hashcode are of use when the objects are used within collections.

Equals helps with collections that helps maintaining only unique objects ( like Set )

compare and compareTo helps with collections that helps maintaining objects in order ( TreeSet, TreeMap etc )

hascode helps with collections that facilitates hash searching ( like hashSet, hashMap etc )

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