code: public E get (Comparable<?> key)
      {
          // determine where we'll be adding the new element
          int eidx = ArrayUtil.binarySearch(
              _entries, 0, _size, new SimpleEntry<Comparable<?>>(key), ENTRY_COMP);
          return (eidx < 0) ? null : _entries[eidx];
      }
docs: Returns the entry that matches (<code>getKey().equals(key)</code>) the specified key or null
  if no entry could be found that matches the key.