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Explain What happens if two threads simultaneously modify TreeSet?

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What happens if two threads simultaneously modify TreeSet? (a) ConcurrentModificationException is thrown (b) Both threads can perform action successfully (c) FailFastException is thrown (d) IteratorModificationException is thrown The question was posed to me in homework. Query is from Data Structures-Set in portion java.util – The Collections Framework of Java Select the correct answer from above options

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Correct choice is (a) ConcurrentModificationException is thrown Best explanation: TreeSet provides fail-fast iterator. Hence when concurrently modifying TreeSet it throws ConcurrentModificationException.

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