Question

So for an assignment at school I am required to make a program in java that manages some students at a college, the user may invoke a number of function, but I started by testing ‘add’.

My prof recommends that I use input redirection, because I can easily test the program over and over, without much typing. Now here is the issue.

echo `< input.txt`
add Student Name 123 Street,City,Province,Postal Code q
#Input rediraction ate my newlines
cat input.txt
add
Student Name
Street,City,Province,Postal Code
q
#What I actually want to run
java -cp . TestCollege < input.txt #fail horribly

As you can see bash removes the newline characters I use to delimit my input, and thus my program crashes, because when you run it in interactive mode, Scanner.getLine() just blocks until input occurs.

Any idea how I can give my program the input with the newlines, it seems to work fine in windows “cmd” but not in “bash”.

Answer 1

Could you try wrapping BufferedInputStream around System.in, because it can handle both cases: \r\n and \n; and I think that’s where your problem lies.

Or rather, call useDelimiter(System.getProperty("line.separator")) on Scanner.