beginnerCollections Framework
What is the difference between HashSet, LinkedHashSet, and TreeSet?
HashSet offers O(1) average add/contains but no ordering guarantee; LinkedHashSet preserves insertion order at a small extra memory cost (a backing linked list); TreeSet keeps elements sorted (natural order or a Comparator) at O(log n) per operation, backed by a red-black tree. Pick based on whether you need speed, insertion order, or sorted order.
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