Write one byte to a file in Java

/* w  w  w .java  2  s  .c o m*/
import java.io.FileOutputStream;

public class Main {

  public static void main(String[] args) throws Exception {
    FileOutputStream fos = new FileOutputStream("C:/demo.txt");

    byte b = 01;
    fos.write(b);
    fos.close();
  }
}