code: public static boolean containsAny(Collection source, Collection candidates) {
          if (isEmpty(source) || isEmpty(candidates)) {
              return false;
          }
          for (Object candidate : candidates) {
              if (source.contains(candidate)) {
                  return true;
              }
          }
          return false;
      }
docs: Return <code>true</code> if any element in '<code>candidates</code>' is
  contained in '<code>source</code>'; otherwise returns <code>false</code>.
  @param source the source Collection
  @param candidates the candidates to search for
  @return whether any of the candidates has been found