title: Java StringBuilder append long String error
body: <p>I tried to append a long String (length of 3000) with java StringBuilder and found out that the appended result is not what I expected.</p>
  
  <p><code>A.append(B)</code> should be <code>AB</code></p>
  
  <p><code>A.append(LongString)</code> becomes <code>A________________(empty spaces)</code></p>
  
  <p>Any idea?</p>
  
  <p>My code: <a href="http://pastebin.com/5CPmHFeS" rel="nofollow">http://pastebin.com/5CPmHFeS</a></p>