Java tutorial
import java.io.DataOutputStream; import java.io.FileOutputStream; public class Main { public static void main(String[] args) throws Exception { FileOutputStream fos = new FileOutputStream("C:/Bytes.txt"); DataOutputStream dos = new DataOutputStream(fos); dos.writeBytes("this is a test"); int bytesWritten = dos.size(); System.out.println("Total " + bytesWritten + " bytes are written to stream."); dos.close(); } }