title: Format String in java
body: <p>How do I format a string with commas to display in curreny format?</p>
  
  <p>Assume the incoming string is a big number. For example:</p>
  
  <blockquote>
    <p>"1234567901234567890123456"</p>
  </blockquote>
  
  <p>I want result as:</p>
  
  <blockquote>
    <p>"12,345,678,901,234,567,890,123,456"</p>
  </blockquote>
  
  <p>The <code>DecimalFormat</code> in Java has a limitation to format a big number.</p>