return value should be considered
 without regard to case.  For example:
 <blockquote><pre>
 String disp = part.getDisposition();
 if (disp == null || disp.equalsIgnoreCase(Part.ATTACHMENT))
        // treat as attachment if not first part
 </pre></blockquote></div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>disposition of this part, or null if unknown</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="MessagingException.html" title="class in jakarta.mail">MessagingEx