java - eclipse 运行时Always save resources before launching 含义

Question

在运行的时候就出现介个了，Always那里的钩可不可以打上呢？
还有这个图片是什么意思呀？

Answer 1

It means this file has not been saved, prompting you whether you need to save it. If you check it, it will be automatically saved next time you start it, and you will not be reminded to click.