title: Why use StringBuilder? StringBuffer can work with multiple thread as well as one thread?
body: <p>Suppose our application have only one thread. and we are using <code>StringBuffer</code> then what is the problem?</p>
  
  <p>I mean if <code>StringBuffer</code> can handle multiple threads through synchronization, what is the problem to work with single thread?</p>
  
  <p>Why use <code>StringBuilder</code> instead?</p>