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These methods are usually overridden when you want to use objects of that type as keys in data structures like hashtables.
- remus.sinorchian November 13, 2013Whenever overriding the equals method is recommended to also override the hashCode method. That is because there must be a relationship between these two methods: equal objects must have equal hash codes, but non-equal objects can have the same hash code.
If the methods are not overridden , then using them as keys in a hashtable is practically impossible (inefficient). By default equals returns true if the two reference variables refer to the same object , and hashCode returns different hash codes for different objects.