title: What are the differences between Helper and Utility classes?
body: <p>How determine how call a class XHelper or XUtils ?</p>
  
  <p>To my mind  :</p>
  
  <p><strong>Helper class</strong>, is a class that can be instantiate and do some business work</p>
  
  <p><strong>Utils class</strong>, is a static class that perform small and repetitive operations on a kind of instance (example of utils classes ArrayUtils or IOUtils from Apache)</p>