Multithreading - StringBuffer and StringBuilder
<blockquote>
  <p>If your text can change and will only
  be accessed from a single thread, use
  a StringBuilder because StringBuilder
  is unsynchronized.</p>
  
  <p>If your text can changes, and will be
  accessed from multiple threads, use a
  StringBuffer because StringBuffer is
  synchronous.</p>
</blockquote>

<p>What does it mean by multiple threads? Can anyone explain me over this? I mean is it something two methods or two programs trying to access another method at same time.</p>
