如果目录中文件的数量发生变化，则通知按钮 [英] Notify a Button if the number of files in a directory change

问题描述

只要目录中没有特定数量的文件，就有一个要禁用的按钮。
目前有什么样的监听程序通知我一个文件被创建或删除了吗？

I have a button that I want to disable as long as there isn't a specific number of files in a directory. Is there some kind of listener that notifies me at the moment a file is created or deleted in a directory?

推荐答案

Java 7将支持文件系统事件内置。

Java 7 will have file system event support built into it.

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