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What Will Happen If You Use Hashmap In A Multithreaded Java Application? |
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Answer» If you USE HashMap in a multithreaded environment in such a way that multiple threads structurally modify the map e.g. add, remove or modify mapping then the internal data STRUCTURE of HashMap MAY get corrupt i.e. some LINKS may go missing, some may point to INCORRECT entries and the map itself may become completely useless. Hence, it is advised not to use HashMap in the concurrent application, instead, you should use a thread-safe map e.g. ConcurrentHashMap or Hashtable If you use HashMap in a multithreaded environment in such a way that multiple threads structurally modify the map e.g. add, remove or modify mapping then the internal data structure of HashMap may get corrupt i.e. some links may go missing, some may point to incorrect entries and the map itself may become completely useless. Hence, it is advised not to use HashMap in the concurrent application, instead, you should use a thread-safe map e.g. ConcurrentHashMap or Hashtable |
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