Core Java · interview question
Given a TreeSet storing product IDs, why might a new product ID not be added even if it appears to be unique?
Multiple choiceHardchapter-4-curatedpremiumcore-javacode-reading-with-collections
Answer and explanation
Correct answer
C. Product ID is not comparable.
Why
TreeSet requires elements to be either naturally ordered or provided with a Comparator. If product IDs are not comparable, the TreeSet cannot determine where to insert the new ID, causing the addition to fail.
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