Uses of Class java.util.OptionalDouble (Java SE 12 & JDK 12 )

## Uses of Class
java.util.OptionalDouble

- 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.

  - ### Uses of OptionalDouble in java.util.stream

    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.