Java中的红黑树或AVL树实现

Question

Is there any Red Black Tree / AVL Tree data structure implementation in Java collections/Guava/Apache Commons library ? If yes , can you point them to me . Basically I am looking for a data structure where the queries should happen in O(lg n) time . There will also be some updates to the data structure but not quite as often as the queries.

Answer 1

Basically I am looking for a data structure where the queries should happen in O(lg n) time

Use a TreeMap . It is backed by a Red-Black tree so it's access time is O(logN) (my emphasis on quote bellow)

public class TreeMap
extends AbstractMap implements
NavigableMap, Cloneable, Serializable

A Red-Black tree based NavigableMap implementation. The map is sorted according to the natural ordering of its keys, or by a Comparator provided at map creation time, depending on which constructor is used.

This implementation provides guaranteed log(n) time cost for the containsKey, get, put and remove operations.