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
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?");
}