| 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  
OptionalDouble instance. | 
static OptionalDouble | 
OptionalDouble.of(double value)
Return an  
OptionalDouble with the specified value present. | 
| Modifier and Type | Method and Description | 
|---|---|
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.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. | 
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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.
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