public NavigableSet<K> navigableKeySet() {BoundedKeySet result = keySet;return result != null ? result : (keySet = new BoundedKeySet());}

public java.util.NavigableSet<K> navigableKeySet(){java.util.TreeMap<K, V>.BoundedMap.BoundedKeySet result = this._keySet;return result != null ? result : (this._keySet = new java.util.TreeMap<K, V>.BoundedMap.BoundedKeySet(this));}
