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Description
The software 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().
Modes of Introduction:
– Implementation
Related Weaknesses
Consequences
Integrity, Other: Other
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.
Potential Mitigations
Phase: Implementation
Description:
Both Equals() and Hashcode() should be defined.