Xiaohe Frontend Team
Nov 18, 2022 · Fundamentals
Why Does HashMap Require a Power‑of‑Two Capacity? Unveiling tableSizeFor
This article explains Java's HashMap initial capacity, how the constructor uses the tableSizeFor method to round the requested size up to the next power of two, and why a power‑of‑two capacity is essential for fast index calculation.
Data StructuresHashMapJava
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