java.util.ConcurrentModificationException
时间: 2023-10-27 19:49:42 浏览: 45
java.util.ConcurrentModificationException is a runtime exception that can occur in a multithreaded environment when a collection is modified while it is being iterated. This exception is thrown to indicate that a thread is trying to modify a collection while another thread is iterating over it.
The ConcurrentModificationException is usually caused when an iterator is used to traverse a collection and the collection is modified by another thread. This can happen when multiple threads are accessing and modifying the same collection at the same time.
To avoid this exception, it is recommended to use thread-safe collections such as ConcurrentHashMap or CopyOnWriteArrayList. Alternatively, you can synchronize access to the collection to ensure that only one thread can modify it at a time.
It is important to note that the ConcurrentModificationException is not always caused by multithreading issues. It can also occur if a collection is modified while it is being iterated by a single thread.
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