Java Modcount (ArrayList) [英] Java Modcount (ArrayList)

问题描述

在 Eclipse 中，我看到 ArrayList 对象有一个 modCount 字段.它的目的是什么?(修改次数?)

In Eclipse, I see that ArrayList objects have a modCount field. What is its purpose? (number of modifications?)

推荐答案

它允许列表的内部知道是否进行了结构修改，可能导致当前操作给出错误结果.

It allows the internals of the list to know if there has been a structural modification made that might cause the current operation to give incorrect results.

如果您曾经因为在迭代列表时修改列表(例如，删除项目)而遇到 ConcurrentModificationException，那么它的内部 modCount 就是从迭代器发出的.

If you've ever gotten ConcurrentModificationException due to modifying a list (say, removing an item) while iterating it, its internal modCount was what tipped off the iterator.

AbstractList 文档很好的详细描述.

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