title: DRYing String spread across several classes
body: <p>I have a Spring Boot app that makes calls to several end-points of a third-party app. &quot;start_date&quot; is passed as a request parameter in most of the calls. Today the string is inlined in classes that make the calls (there is one class for each third-party end-point). I would like to DRY the Strings.</p>
  <p>If the calls were made from a single class, I could have a <code>private static final START_DATE = &quot;start_date&quot;</code> in that class. But the calls are in multiple classes. Is there a better solution than have a class dedicated to holding the values?</p>
  <p>Note: Besides &quot;start_date&quot; there are 3 or 4 other request parameters that are also shared.</p>