Why would you wrap FileOutputStream with a DataOutputStream?
<p>A DataOutputStream can wrap a FileOutputStream, but I don't understand why it has been used here.</p>

<pre><code>FileOutputStream fos = new FileOutputStream(args[0]);
DataOutputStream dos = new DataOutputStream(fos);
dos.writeByte('j');
</code></pre>

<p>The last line does the same as <code>fos.write('j');</code> What does DataOutputStream add in this situation? i.e. why is there?</p>
