pass input file to class from console

[cherrychives]

At the moment I have a java program which reads a text file and does certain operations with its contents.. how do I change this:

scan = new Scanner(new FileReader(inputtextfile.txt))

..so that I can give the file to the program directly from the console, like so:

java myProgram inputtextfile.txt

[jlczuk]

System.in is stdin, which is where your console input comes from.

BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
String input;
input = in.readLine();

[cherrychives]

So I cannot use Scanner for this??

[jlczuk]

Well, I showed you a way to use it, think about how you can take that information and use it with Scanner.

[Tolls]

System.in is stdin, which is where your console input comes from.

BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
String input;
input = in.readLine();

They want to supply the filename at teh command line, not read input from Sys.in.

For the OP...parameters like your filename are what exist in the args parameter on the main() method.
In your example args[0] would contain the value "inputtextfile.txt", which you can pass into the line creating the Scanner instead of the hardcoded filename.

[JosAH]

They want to supply the filename at teh command line, not read input from Sys.in.

For the OP...parameters like your filename are what exist in the args parameter on the main() method.
In your example args[0] would contain the value "inputtextfile.txt", which you can pass into the line creating the Scanner instead of the hardcoded filename.

For MS Window you can get away with it by supplying 'CON:' as a file name.

kind regards,

Jos