Additional Notes
What are the consequences of using mutable objects in a HashSet?
Track: Java
Topic: Collections
Focus: Set Interface and HashSet
Java: Set Interface and HashSet
Answer
Mutating objects can break HashSet's unique element guarantee.
If an object changes after being added to a HashSet, its hash code might change, making it unreachable or causing duplicates when re-added. For example, modifying productID in a Product object after adding it to a HashSet can lead to lookup failures or duplicate entries.
If an object changes after being added to a HashSet, its hash code might change, making it unreachable or causing duplicates when re-added. For example, modifying productID in a Product object after adding it to a HashSet can lead to lookup failures or duplicate entries.
Topics: Collections Java Set Interface and HashSet