Question: java HashMap and HashSet are not thread safe- by design. What are the hazards, concerning concurrency? How would you solve this potential problem? For Blocking

java HashMap and HashSet are not thread safe- by design. What are java

HashMap and HashSet are not thread safe- by design. What are the hazards, concerning concurrency? How would you solve this potential problem? For Blocking Queues, pout() and take() are synchronized methods. Why is this required

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