When should I use ConcurrentSkipListMap?

Question

In Java, ConcurrentHashMap is there for better multithreading solution. Then when should I use ConcurrentSkipListMap? Is it a redundan

Answer 1

Sorted, navigable, and concurrent

See Skip List for a definition of the data structure.

A ConcurrentSkipListMap stores the Map in the natural order of its keys (or some other key order you define). So it'll have slower get/put/contains operations than a HashMap, but to offset this it supports the SortedMap, NavigableMap, and ConcurrentNavigableMap interfaces.