Additional Notes
How would you explain a common pitfall with equals and hashCode in inheritance in an interview?
Track: Java
Topic: Core Java
Focus: equals and hashCode in Collections
Java: equals and hashCode in Collections
Answer
Failing to maintain the contract when subclassing.
When extending a class, if equals or hashCode is overridden in the subclass, it may violate the contract established by the superclass. For instance, if a subclass of Product doesn't call super.equals in its equals method, it might improperly compare with superclass instances.
When extending a class, if equals or hashCode is overridden in the subclass, it may violate the contract established by the superclass. For instance, if a subclass of Product doesn't call super.equals in its equals method, it might improperly compare with superclass instances.
Topics: Core Java equals and hashCode in Collections Java