332      * The comparator used to maintain order in this map, or null if

   332      * The comparator used to maintain order in this map, or null if

   333      * using natural ordering.  (Non-private to simplify access in

   333      * using natural ordering.  (Non-private to simplify access in

   334      * nested classes.)

   334      * nested classes.)

   335      * @serial

   335      * @serial

   336      */

   336      */

   337     final Comparator<? super K> comparator;

   338     final Comparator<? super K> comparator;

   338 

   339 

   339     /** Lazily initialized topmost index of the skiplist. */

   340     /** Lazily initialized topmost index of the skiplist. */

   340     private transient Index<K,V> head;

   341     private transient Index<K,V> head;

   341     /** Lazily initialized element count */

   342     /** Lazily initialized element count */

  2373         private static final long serialVersionUID = -7647078645895051609L;

  2374         private static final long serialVersionUID = -7647078645895051609L;

  2374 

  2375 

  2375         /** Underlying map */

  2376         /** Underlying map */

  2376         final ConcurrentSkipListMap<K,V> m;

  2377         final ConcurrentSkipListMap<K,V> m;

  2377         /** lower bound key, or null if from start */

  2378         /** lower bound key, or null if from start */

  2378         private final K lo;

  2380         private final K lo;

  2379         /** upper bound key, or null if to end */

  2381         /** upper bound key, or null if to end */

  2380         private final K hi;

  2383         private final K hi;

  2381         /** inclusion flag for lo */

  2384         /** inclusion flag for lo */

  2382         private final boolean loInclusive;

  2385         private final boolean loInclusive;

  2383         /** inclusion flag for hi */

  2386         /** inclusion flag for hi */

  2384         private final boolean hiInclusive;

  2387         private final boolean hiInclusive;