Class java.util.TreeMap

Added interface java.util.NavigableMap.

Added Methods
(Entry<K, V>) ceilingEntry(K)  
K ceilingKey(K)  
NavigableSet<K> descendingKeySet()  
(NavigableMap<K, V>) descendingMap()  
(Entry<K, V>) firstEntry()  
(Entry<K, V>) floorEntry(K)  
K floorKey(K)  
(NavigableMap<K, V>) headMap(K, boolean)  
(Entry<K, V>) higherEntry(K)  
K higherKey(K)  
(Entry<K, V>) lastEntry()  
(Entry<K, V>) lowerEntry(K)  
K lowerKey(K)  
NavigableSet<K> navigableKeySet()  
(Entry<K, V>) pollFirstEntry()  
(Entry<K, V>) pollLastEntry()  
(NavigableMap<K, V>) subMap(K, boolean, K, boolean)  
(NavigableMap<K, V>) tailMap(K, boolean)