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 randomnumber generator, and a bit array).

java.util.concurrent 
Utility classes commonly useful in concurrent programming.

java.util.concurrent.atomic 
A small toolkit of classes that support lockfree threadsafe
programming on single variables.

java.util.stream 
Classes to support functionalstyle operations on streams of elements, such
as mapreduce transformations on collections.

Modifier and Type  Method and Description 

static void 
Arrays.parallelPrefix(double[] array,
DoubleBinaryOperator op)
Cumulates, in parallel, each element of the given array in place,
using the supplied function.

static void 
Arrays.parallelPrefix(double[] array,
int fromIndex,
int toIndex,
DoubleBinaryOperator op)
Performs
Arrays.parallelPrefix(double[], DoubleBinaryOperator)
for the given subrange of the array. 
Modifier and Type  Method and Description 

double 
ConcurrentHashMap.reduceEntriesToDouble(long parallelismThreshold,
ToDoubleFunction<Map.Entry<K,V>> transformer,
double basis,
DoubleBinaryOperator reducer)
Returns the result of accumulating the given transformation
of all entries using the given reducer to combine values,
and the given basis as an identity value.

double 
ConcurrentHashMap.reduceKeysToDouble(long parallelismThreshold,
ToDoubleFunction<? super K> transformer,
double basis,
DoubleBinaryOperator reducer)
Returns the result of accumulating the given transformation
of all keys using the given reducer to combine values, and
the given basis as an identity value.

double 
ConcurrentHashMap.reduceToDouble(long parallelismThreshold,
ToDoubleBiFunction<? super K,? super V> transformer,
double basis,
DoubleBinaryOperator reducer)
Returns the result of accumulating the given transformation
of all (key, value) pairs using the given reducer to
combine values, and the given basis as an identity value.

double 
ConcurrentHashMap.reduceValuesToDouble(long parallelismThreshold,
ToDoubleFunction<? super V> transformer,
double basis,
DoubleBinaryOperator reducer)
Returns the result of accumulating the given transformation
of all values using the given reducer to combine values,
and the given basis as an identity value.

Constructor and Description 

DoubleAccumulator(DoubleBinaryOperator accumulatorFunction,
double identity)
Creates a new instance using the given accumulator function
and identity element.

Modifier and Type  Method and Description 

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. 
double 
DoubleStream.reduce(double identity,
DoubleBinaryOperator op)
Performs a reduction on the
elements of this stream, using the provided identity value and an
associative
accumulation function, and returns the reduced value.

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For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developertargeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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