minor bug, TreeMap.NavigableSubMap.entrySetView usage

[charlie hunt]

Looks like TreeMap.NavigableSubMap.entrySetView is initialized to null, 
but it is never updated when an "entry set view" is created by 
TreeMap.AscendingSubMap.entrySet() or by 
TreeMap.DescendingSubMap.entrySet().

I think those two methods were intended to be implemented as:
For AscendingSubMap:
       public Set<Map.Entry<K,V>> entrySet() {
           EntrySetView es = entrySetView;
           return (es != null) ? es : (entrySetView = new 
AscendingEntrySetView());
       }
For DescendingSubMap:
       public Set<Map.Entry<K,V>> entrySet() {
           EntrySetView es = entrySetView;
           return (es != null) ? es : (entrySetView = new 
DescendingEntrySetView());

A related question:
Is there a need to explicitly initialize; 
NavigableSubMap.descendingMapView, NavigableSubMap.entrySetView and 
NavigableSubMap.navigableKeySetView to null?  Aren't they going to be 
initialized to null by default without requiring an explicit load & 
store of null?

thanks,

charlie ...
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