Uses of Class java.util.OptionalDouble (Java 14 API文档 & JDK 14 API文档) - 手册

Packages that use OptionalDouble
Package	Description
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 OptionalDouble in java.util

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

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