Web Reference: We show how to use HashSet and HashMap and explain why you might want to use them. Mar 26, 2026 · HashSet internally uses a hash table (via HashMap), where elements are stored based on their hash codes. Sometimes, different elements may produce the same hash code, leading to a collision. Jul 3, 2025 · In this article, we outlined the utility of a HashSet, its purpose as well as its underlying working. We saw how efficient it is in terms of usability given its constant time performance and ability to avoid duplicates.
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