我正在为我们的软件，消除尚未一个多月应用于所有的图像文件的清除功能。要做到这一点，我检查两件事情：

I'm writing a purge function for our software that removes all image files that haven't been used in over a month. To do this, I am checking two things:

查询比文件检查要慢得多。所以，我想最好是能够重置失败的第一次检查所有文件的最后修改日期，但通过第二道，这样（例如）的古老的，但经常使用的文件列表不逐步增加处理管理系统的负荷。

The query is much slower than the file check. So I would ideally like to be able to reset the last modified date on any files that fail the first check, but pass the second, so that (for example) a list of venerable but often-used files aren't gradually increasing the processing load of the management system.

有没有办法做到这一点不诉诸原油的东西（甚至可能更慢），就像每个文件重命名为一个临时的标签，然后自己？

Is there a way to do this without recourse to something crude (and possibly even slower), like renaming each file to a temporary label, then itself?

推荐答案

setLastModified（）是在任何Java 文件的标准方法对象，您可以用它来更新此值。

setLastModified() is a standard method on any Java File object that you can use to update this value.

SDK文档。