title: A quick and easy way to join array elements with a separator (the opposite of split) in Java
body: <p>See <a href="https://stackoverflow.com/questions/455438/opposite-of-string-split-with-separators-net">Related .NET question</a> </p>
  
  <p>I'm looking for a quick and easy way to do exactly the opposite of split
  so that it will cause  <code>["a","b","c"]</code> to become <code>"a,b,c"</code></p>
  
  <p>Iterating through an array requires either adding a condition (if this is not the last element, add the seperator) or using substring to remove the last separator.</p>
  
  <p>I'm sure there is a certified, efficient way to do it (Apache Commons?)</p>
  
  <p>How do you prefer doing it in your projects?</p>