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2.2 HashSet Hashing & The equals/hashCode Contract
Topic Summary
Learn how HashSet leverages HashMap under the hood, why overriding equals() requires hashCode(), and how to avoid memory leaks.
What You Will Learn
• Understand the 3 rules of the `equals()` and `hashCode()` contract.
• Explain how `HashSet` prevents duplicate elements in $O(1)$ average time.
• Diagnose memory leaks caused by mutating key fields after insertion.
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