Exception in thread "main" java.util.ConcurrentModificationExceptions
用java的Map時候碰到這樣一個錯誤Exception in thread "main" java.util.ConcurrentModificationExceptionjava 我在遍歷Map（用迭代器）的時候刪除了某些元素，而後調用迭代器是時候就觸發了這個錯誤，我就看一下源碼，緣由是Map和Iterator中維持了這樣一個遍歷modcount，用來記錄Map和Iterator中修改數據
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