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According to the Java API \[[API 062006|AA. Java References#API 06]\] class {{java.lang.Object}} documentation:

This compliant solution shows how the {{hashCode()}} method can be overridden so that the same value is generated for any two instances that compare equal when {{Object.equals()}} is used. Bloch discusses the recipe to generate such a hash function in good detail \[[Bloch 082008|AA. Java References#Bloch 08]\].

\[[API 062006|AA. Java References#API 06]\] [Class Object|http://java.sun.com/javase/6/docs/api/java/lang/Object.html]
\[[Bloch 082008|AA. Java References#Bloch 08]\] Item 9: Always override {{hashCode}} when you override {{equals}}
\[[MITRE 092009|AA. Java References#MITRE 09]\] [CWE ID 581|http://cwe.mitre.org/data/definitions/581.html] "Object Model Violation: Just One of Equals and Hashcode Defined"