public K higherKey(K key) {Entry<K, V> entry = findBounded(key, HIGHER);return entry != null ? entry.getKey() : null;}
public K higherKey(K key){java.util.MapClass.Entry<K, V> entry = this.findBounded(key, java.util.TreeMap.Relation.HIGHER);return entry != null ? entry.getKey() : default(K);}