Java ProcessBuilder redirect input, output and error to files

import java.io.File;
import java.io.IOException;

public class Main {

   public static void main(String[] args) {
      try {//from   w  ww . j  ava 2  s .co m
         File commands = new File("C:/Projects/ProcessCommands.txt");
         File output = new File("C:/Projects/ProcessLog.txt");
         File errors = new File("C:/Projects/ErrorLog.txt");

         ProcessBuilder pb = new ProcessBuilder("cmd");
         System.out.println(pb.redirectInput().toString());
         System.out.println(pb.redirectOutput().toString());
         System.out.println(pb.redirectError().toString());

         pb.redirectInput(commands);
         pb.redirectError(errors);
         pb.redirectOutput(output);
         System.out.println(pb.redirectInput().toString());
         System.out.println(pb.redirectOutput().toString());
         System.out.println(pb.redirectError().toString());

         pb.start();
      } catch (IOException ex) {
         ex.printStackTrace();
      }

   }
}