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How to get the element from hashset that is known to contain exactly 1 element? (without iterating it)
985
HashSet. size() method is used to get the size of the HashSet or the number of elements present in the HashSet. Parameters: This method does not takes any parameter. Return Value: The method returns the size or the number of elements present in the HashSet.
Yes, accessing and finding an element in HashSet is O(1). HashSet stores elements using the hashing technique. Another important property of HashSet is that it contains only unique elements. For example you can check if the element already exists in HashSet.
The contains() method of Java HashSet class is used to check if this HashSet contains the specified element or not. It returns true if element is found otherwise, returns false.
You could use Single()
var element = yourHashSet.Single();
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