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If two threads access the same hashmap at the same time, what would happen?

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If two threads access the same hashmap at the same time, what would happen?

(a) ConcurrentModificationException

(b) NullPointerException

(c) ClassNotFoundException

(d) RuntimeException

I had been asked this question in an online interview.

Asked question is from Data Structures-HashMap topic in portion java.util – The Collections Framework of Java

1 Answer

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Best answer
Right option is (a) ConcurrentModificationException

The best I can explain: The code will throw ConcurrentModificationException if two threads access the same hashmap at the same time.

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