Exception in thread "main" java.util.ConcurrentModificationExceptions
用java的Map时候碰到这样一个错误Exception in thread "main" java.util.ConcurrentModificationExceptionjava 我在遍历Map（用迭代器）的时候删除了某些元素，而后调用迭代器是时候就触发了这个错误，我就看一下源码，缘由是Map和Iterator中维持了这样一个遍历modcount，用来记录Map和Iterator中修改数据
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