CWE-581—Object Model Violation: Just One of Equals and Hashcode Defined

PUBLISHEDweakness record
released 2006-12-15 · last modified 2025-12-11

Metadata

CWE ID：
CWE-581
摘要：
Variant
结构：
Simple
状态：
Draft
发布日期：
2006-12-15
更新日期：
2025-12-11

名称

Object Model Violation: Just One of Equals and Hashcode Defined

描述

The product does not maintain equal hashcodes for equal objects.

Java objects are expected to obey a number of invariants related to equality. One of these invariants is that equal objects must have equal hashcodes. In other words, if a.equals(b) == true then a.hashCode() == b.hashCode().

常见后果

范围：
Integrity, Other
影响：
Other
注释：
If this invariant is not upheld, it is likely to cause trouble if objects of this class are stored in a collection. If the objects of the class in question are used as a key in a Hashtable or if they are inserted into a Map or Set, it is critical that equal objects have equal hashcodes.

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