Engineering Interviews · interview question
In a multi-threaded environment, which of the following is a potential issue when using HashMap?
Multiple choiceMediumchapter-20-curatedpremiumengineering-interviewscode-review-spotting-bugs
Answer and explanation
Correct answer
D. ConcurrentModificationException
Why
HashMap is not synchronized, and if it is modified concurrently by multiple threads, it may lead to a ConcurrentModificationException. For thread safety, consider using ConcurrentHashMap.
Test yourself on Engineering Interviews
A free test with instant, explained results. No account needed.
More Engineering Interviews questions
- In the context of JVM memory architecture, what is the primary role of the 'stack'?
- Why is it important to first outline a high-level design before diving into coding during a system design interview?
- During a live coding interview, why is it important to verbalize your thought process?
- What does the 'Result' component in the STAR framework mainly aim to achieve?
- Why is it crucial to agree on an algorithm before writing code in a live coding interview?
- In a code review, which type of bug is most critical to address immediately?