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negative-zero

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Top Architect

Feb 18, 2022 · Backend Development

Understanding Java Float -0.0 and hashCode: Why 0.0 and -0.0 Behave Differently in Maps

This article explains why Java's Float values 0.0 and -0.0 have different hashCode results, how that affects their use as Map keys, and demonstrates the underlying IEEE‑754 representation and related debugging steps with concrete code examples.

HashCodeJavafloat

0 likes · 9 min read

Understanding Java Float -0.0 and hashCode: Why 0.0 and -0.0 Behave Differently in Maps

Top Architect

Jan 23, 2022 · Fundamentals

Understanding Java Float hashCode: Why -0.0 and 0.0 Behave Differently as Map Keys

This article explains how Java's Float hashCode treats 0.0 and -0.0 as distinct values, causing unexpected behavior when using floating‑point numbers as HashMap keys, and shows how to debug, reproduce, and avoid the issue by using alternative representations.

HashCodeHashMapJava

0 likes · 10 min read

Understanding Java Float hashCode: Why -0.0 and 0.0 Behave Differently as Map Keys