Listener to prevent System.out display on the screen

Question

I was doing my academic project and while building and testing i have put many println() statements.

But when I had to submit all prints should not be displayed.

Can i implement something like listener which will be invoked when System.out is tried to be executed and prevents it from displaying. I dont know how feasible this idea is but just want to know whether its possible or not. I know i could have used a log file or write into a file but again its just a thought came into my mind if I have to disable SOP how can i do it ..

thanks

Answer 1

use System.setOut function (and setErr) The following program will only print 1: (and not 2)

public static void main(String[] args) throws FileNotFoundException {
    System.out.println("1");
    System.setOut(new PrintStream(new OutputStream() {
        @Override
        public void write(int arg0) throws IOException {
            // TODO Auto-generated method stub

        }
    }));
    System.out.println("2");
}

Answer 2

The correct thing to do is to either use flags before printlns, or better yet, to use a Logger (there are many versions available).

It is, however, possible to reroute all System.out away. Search for "redirect system.out" and you will find plenty of examples.