Additional Notes
What common mistake occurs with HashSet and custom objects?
Track: Java
Topic: Collections
Focus: Collection Performance Basics
Java: Collection Performance Basics
Answer
Failing to override hashCode() and equals().
When using HashSet with custom objects, you must override hashCode() and equals() methods to ensure correct behavior. Without this, two logically equal product objects might be treated as different, leading to unexpected duplicates.
When using HashSet with custom objects, you must override hashCode() and equals() methods to ensure correct behavior. Without this, two logically equal product objects might be treated as different, leading to unexpected duplicates.
Topics: Collection Performance Basics Collections Java