What is the hashCode() method?

The hashCode() method is defined in the java.lang.Object class. It returns the hash code of the invoking object. The hash code value returned by this method is a number of type int. The signature of the hashCode() method is given below:

public int hashCode()

Note: Objects that are equal according to the equals(Object) method always produce the same hash code value. However, it is not necessary for the objects that are unequal according to the equals(java.lang.Object) method to produce different hash code values.

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