Java System.setOut(PrintStream out)

public static void setOut(PrintStream out)

//from  ww  w. j a v a  2  s.  c  o m

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

public class Main {

   public static void main(String[] args) throws Exception{
    
     FileOutputStream f = new FileOutputStream("file.txt");
     
     System.setOut(new PrintStream(f));
        
     System.out.println("This is from java2s.com");
   }
}