hasNext() – when does it block and why?

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There is a difference between testing via Console or via TextFile. If I read from Console the program expects a Stream and it will wait for further Input.

When testing via Input from Textfile (still with System.in for the Scanner, using Java Program ) the hasNext() will return false at the end of the file as no further Input can be done.

I can’t really find documentation (in https://docs.oracle.com/javase/9/docs/api/java/util/Scanner.html#hasNext–) on this Topic. So if anyone finds a proper and technical correct answer I would be very greatfull.

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