Java中的流如何影响内存消耗？

I have been using streams many times but I never read much about how they actually works. Nor do I know much about them other than that a stream is just a metaphor. A stream only represent a sequence of bytes. I don't know much about how they actually work, I guess opening a file stream in Java interact with the OS that have the functionality to give a "pointer" to a stream. I have been using streams many times but I neve