Additional Notes
What happens if mutable objects are used in a HashSet?
Track: Java
Topic: Collections
Focus: Set Interface and HashSet
Java: Set Interface and HashSet
Answer
Changing a mutable object's state can corrupt HashSet behavior.
If an object's fields used in hashCode() or equals() are mutable, modifying them can make the object unreachable or cause duplicate entries. For instance, altering a Product's ID used in hashCode() can make it unfindable in the catalog.
If an object's fields used in hashCode() or equals() are mutable, modifying them can make the object unreachable or cause duplicate entries. For instance, altering a Product's ID used in hashCode() can make it unfindable in the catalog.
Topics: Collections Java Set Interface and HashSet