Uses of Class java.util.OptionalLong (Java SE 15 & JDK 15)
Description: use: module: java.base, package: java.util, class: OptionalLong

# 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.

- ## 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.

- ## Uses of OptionalLong in jdk.incubator.foreign

  Methods in jdk.incubator.foreign that return OptionalLong
  Modifier and Type | Method | Description
  --- | --- | ---
  `OptionalLong` | SequenceLayout.`elementCount()` | Returns the element count of this sequence layout (if any).