Additional Notes
What happens if you add a null value to a HashSet?
Track: Java
Topic: Collections
Focus: Set Interface and HashSet
Java: Set Interface and HashSet
Answer
HashSet allows one null element. Frame the concept in practical terms so you can explain it during interview discussion.
HashSet can store a single null value. For instance, adding null to a HashSet of product IDs will succeed, but adding another null will have no effect since null is already present.
HashSet can store a single null value. For instance, adding null to a HashSet of product IDs will succeed, but adding another null will have no effect since null is already present.
Topics: Collections Java Set Interface and HashSet