| Package | Description | 
|---|---|
| java.util | Contains the collections framework, legacy collection classes, event model,
date and time facilities, internationalization, and miscellaneous utility
classes (a string tokenizer, a random-number generator, and a bit array). | 
| java.util.stream | Classes to support functional-style operations on streams of elements, such
 as map-reduce transformations on collections. | 
| Modifier and Type | Method and Description | 
|---|---|
| static OptionalDouble | OptionalDouble. empty()Returns an empty  OptionalDoubleinstance. | 
| static OptionalDouble | OptionalDouble. of(double value)Return an  OptionalDoublewith the specified value present. | 
| Modifier and Type | Method and Description | 
|---|---|
| OptionalDouble | DoubleStream. average()Returns an  OptionalDoubledescribing the arithmetic
 mean of elements of this stream, or an empty optional if this
 stream is empty. | 
| OptionalDouble | LongStream. average()Returns an  OptionalDoubledescribing the arithmetic mean of elements of
 this stream, or an empty optional if this stream is empty. | 
| OptionalDouble | IntStream. average()Returns an  OptionalDoubledescribing the arithmetic mean of elements of
 this stream, or an empty optional if this stream is empty. | 
| OptionalDouble | DoubleStream. findAny()Returns an  OptionalDoubledescribing some element of the stream,
 or an emptyOptionalDoubleif the stream is empty. | 
| OptionalDouble | DoubleStream. findFirst()Returns an  OptionalDoubledescribing the first element of this
 stream, or an emptyOptionalDoubleif the stream is empty. | 
| OptionalDouble | DoubleStream. max()Returns an  OptionalDoubledescribing the maximum element of this
 stream, or an empty OptionalDouble if this stream is empty. | 
| OptionalDouble | DoubleStream. min()Returns an  OptionalDoubledescribing 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  OptionalDoubledescribing the reduced
 value, if any. | 
 Submit a bug or feature 
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
 Copyright © 1993, 2017, Oracle and/or its affiliates.  All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.