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How the Null is allowed any where in first two(HashSet,, LinkedHashSet) and allowed only as first element in other(TreeSet).
LinkedHashSet - stores elements together with the order they were added. You can ask "is X in the set and what was the 2nd element added to the set?"
TreeSet - stores elements and keep them sorted. You can ask "is X in the set and what is the first element in order in the set"
cannot i ask below question to TreeSet as well? why not
You can ask "is X in the set and what was the 2nd element added to the set?"
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