问题
I just want to know, we usually close streams at the end, but why don't we close System.out PrintStream with System.out.close()?
回答1:
If you close it you will no longer be able to write to the console, so let's leave this task to the VM when the process terminates. You should only close streams that you own or have manually created. System.out is out of your control, so leave it to the creator to take care of.
回答2:
because we didn't open it the VM did and it's his job to close it unless otherwise documented
it's similar to the C++ adage of I don't own it, don't delete it.
回答3:
You can still flush() it, of course.
来源：https://stackoverflow.com/questions/7457723/why-dont-we-close-system-out-stream-after-using-it