Collections
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Collections
equals() and hashcode()
- Mainly used for storing and retrieving objects from hashed collections.
- First object's hashcode is used to figure out which hash bucket the object is in
- Then the equals() method is used to compare objects in the same hash bucket.
This means that:
- equal objects MUST have the same hashcode
- unequal objects can have the same (or different) hashcode (e.g. same bucket but objects are different)
- objects having different hashcodes MUST be unequal
