Uses of Class
java.util.OptionalLong

Packages that use OptionalLong 
Package Description
java.net.http
HTTP Client and WebSocket APIs
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.stream
Classes to support functional-style operations on streams of elements, such as map-reduce transformations on collections.
jdk.incubator.foreign
Classes to support low-level, safe and efficient memory access.