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)