Determine number of bytes written to DataOutputStream : DataOutputStream « File « Java Tutorial

1. Java Tutorial
2. File
3. DataOutputStream

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();
  }
}