Additional Notes
Why might a HashSet not prevent duplicates with custom objects?
Track: Java
Topic: Collections
Focus: Set Interface and HashSet
Java: Set Interface and HashSet
Answer
If hashCode() and equals() are not correctly overridden, duplicates can occur.
For custom objects, you must override hashCode() and equals() methods to define equality. Incorrect implementations can lead to failures in duplicate prevention. For instance, in an e-commerce setup, a poorly defined Product class might mistakenly allow duplicate entries.
For custom objects, you must override hashCode() and equals() methods to define equality. Incorrect implementations can lead to failures in duplicate prevention. For instance, in an e-commerce setup, a poorly defined Product class might mistakenly allow duplicate entries.
Topics: Collections Java Set Interface and HashSet