HashSet internally uses HashMap to store it’s elements. Whenever you create a HashSet object, one HashMap object associated with it is also created. This HashMap object is used to store the elements you enter in the HashSet. The elements you add into HashSet are stored as keys of this HashMap object. The value associated with those keys will be a constant.
See more at https://javaconceptoftheday.com/how-hashset-works-internally-in-java/
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