write array of bytes to a file

Hello all, i am having problems. I am trying to simply write the array bytes out to a .dat file,
it is creating the file but it is empty. I'm not to good at Java IO so I need help - what am i doing wrong??
thanks , here is the code:
File f2 = new File("writeQdata.txt"); try { BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(f2)); ** b[ ]the array has 131072 bytes bos.write(b, 0, b.length); bos.flush(); } catch (IOException e) { ...

No idea I am afraid, I tried it and it workds fine???
import java.io.*; public class sample { private byte[] b=new byte[131072]; public sample() { byte aByte; for (int i = 0; i < b.length; i++) { b[i] = (byte)((Math.random() * 255) - 128); } File f2 = new File("writeQdata.txt"); try { BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(f2)); //** b[ ]the array has 131072 bytes bos.write(b, 0, b.length); bos.flush(); //bos.close(); } catch (IOException e) { System.out.println("IOException occured: " + e.getMessage()); } } public static void main(String[] args) { sample thisClass = new sample(); } }
Are you sure this is a full excerpt from your code ?