问号在Java cron中的意义 [英] Significance of question mark in Java cron

问题描述

源维基百科：

问号（？）代替*每月的日期或星期几的空白。

上述说法对我来说没有多大意义。

所以如果我写一些cron作为 0 0 0？

这是一个有点混乱的，因为它是每个月的第一次，

解决方案

我不是Cron的专家的无情开始）

但根据 www.cronmaker.com ，它每天执行。 / p>

Source Wikipedia:

Question mark (?) is used instead of '*' for leaving either day-of-month or day-of-week blank.

The above statement is not making much sense to me.

So if I write some cron as 0 0 0 ? * * then does it mean first of every month or it means it will execute daily?

It is a bit confusing as Java crons start with seconds while other crons start with minute.

解决方案

I am not Cron expert (I think - it is just bunch of nonsence starts)
But according www.cronmaker.com it is executed daily.

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