Uses of Class java.util.OptionalLong (Java SE 13 & JDK 13 )

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.

Uses of OptionalLong in java.net.http

Methods in java.net.http that return OptionalLong
Modifier and Type	Method	Description
`OptionalLong`	HttpHeaders.`firstValueAsLong(String name)`	Returns an `OptionalLong` containing the first header string value of the named header field.

Uses of OptionalLong in java.util

Methods in java.util that return OptionalLong
Modifier and Type	Method	Description
`static OptionalLong`	OptionalLong.`empty()`	Returns an empty `OptionalLong` instance.
`static OptionalLong`	OptionalLong.`of(long value)`	Returns an `OptionalLong` describing the given value.

Uses of OptionalLong in java.util.stream

Methods in java.util.stream that return OptionalLong
Modifier and Type	Method	Description
`OptionalLong`	LongStream.`findAny()`	Returns an `OptionalLong` describing some element of the stream, or an empty `OptionalLong` if the stream is empty.
`OptionalLong`	LongStream.`findFirst()`	Returns an `OptionalLong` describing the first element of this stream, or an empty `OptionalLong` if the stream is empty.
`OptionalLong`	LongStream.`max()`	Returns an `OptionalLong` describing the maximum element of this stream, or an empty optional if this stream is empty.
`OptionalLong`	LongStream.`min()`	Returns an `OptionalLong` describing the minimum element of this stream, or an empty optional if this stream is empty.
`OptionalLong`	LongStream.`reduce(LongBinaryOperator op)`	Performs a reduction on the elements of this stream, using an associative accumulation function, and returns an `OptionalLong` describing the reduced value, if any.