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  1. What is the relation between hashset and hashmap?
    1. HashSet is the interface; HashMap is the concrete class
    2. HashMap is the interface; HashSet is the concrete class
    3. HashMap internally implements HashSet
    4. HashSet internally implements HashMap
    5. None of these
Correct Option: D

HashSet is implemented to provide uniqueness feature which is not provided by HashMap. This also reduces code duplication and provides the memory efficient behavior of HashMap.


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