Uses of Interface
java.util.NavigableMap

Packages that use NavigableMap 
Package Description
java.time.zone
Support for time-zones and their rules.
java.util
Contains the collections framework, some internationalization support classes, a service loader, properties, random number generation, string parsing and scanning classes, base64 encoding and decoding, a bit array, and several miscellaneous utility classes.
java.util.concurrent
Utility classes commonly useful in concurrent programming.