---
title: "Discussion on \"How Java HashMap Prevents Hash Collision DoS Attacks\" | Hashnode"
description: "Discussion on \"How Java HashMap Prevents Hash Collision DoS Attacks\". Learn how Java's HashMap mitigates Hash Collision DoS attacks using treeification to reduce lookup complexity from O(N) to O(log N)."
url: "https://hashnode.com/posts/how-java-hashmap-prevents-hash-collision-dos/6ac3c87b4bf2dc0b3ea2ba1a"
---

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# [How Java HashMap Prevents Hash Collision DoS Attacks](https://doogal.dev/how-java-hashmap-prevents-hash-collision-dos?utm_source=hashnode&utm_medium=feed)

Learn how Java's HashMap mitigates Hash Collision DoS attacks using treeification to reduce lookup complexity from O(N) to O(log N).

Oct 5 · 5 min read · doogal.dev  
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-   [#datastructures](https://hashnode.com/tag/datastructures)

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