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.concurrent |
Utility classes commonly useful in concurrent programming.
|
java.util.concurrent.atomic |
A small toolkit of classes that support lock-free thread-safe
programming on single variables.
|
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 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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