Uses of Interface

Packages that use UnaryOperator
Provides a simple high-level Http server API, which can be used to build embedded HTTP servers.
Access to date and time using fields and units, and date time adjusters.
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.
A small toolkit of classes that support lock-free thread-safe programming on single variables.
Functional interfaces provide target types for lambda expressions and method references.
Classes to support functional-style operations on streams of elements, such as map-reduce transformations on collections.