Resetting Standard output Stream

Question

I know that there is a function in Java to set Standard Output Stream to any user defined value using System.setOut method..

But is there any method to

Answer 1

You can get hold of the file descriptor for standard out through FileDescriptor.out. To reset standard out to print to console, you do

System.setOut(new PrintStream(new FileOutputStream(FileDescriptor.out)));

Another way is to simply hold on to the original object, as follows:

PrintStream stdout = System.out;
System.setOut(new PrintStream(logFile));

// ...

System.setOut(stdout);                   // reset to standard output

Answer 2

This is an old question, but it turns up in Google search all the time and I wanted to correct it. You can actually get it, by using the FileDescriptor class. Calling new PrintStream(new FileOutputStream(FileDescriptor.out))) should give you something which prints to stdout.

import java.io.FileDescriptor;
import java.io.FileOutputStream;
import java.io.PrintStream;


public static void main(String [] args) {
    System.err.println("error.");
    System.out.println("out.");
    System.setOut(System.err);
    System.out.println("error?");
    System.setOut(new PrintStream(new FileOutputStream(FileDescriptor.out)));
    System.out.println("out?");
}