default <RR> LongCollector<A,RR> |
LongCollector.andThen(Function<R,RR> finisher) |
Adapts this collector to perform an additional finishing transformation.
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static LongCollector<?,OptionalDouble> |
LongCollector.averaging() |
Returns a LongCollector that produces the arithmetic mean of the
input elements or an empty optional if no elements are collected.
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static LongCollector<?,Long> |
LongCollector.counting() |
Returns a LongCollector that counts the number of input elements
and returns the result as Long.
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static LongCollector<?,Integer> |
LongCollector.countingInt() |
Returns an LongCollector that counts the number of input elements
and returns the result as Integer.
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static <K> LongCollector<?,Map<K,long[]>> |
LongCollector.groupingBy(LongFunction<? extends K> classifier) |
Returns a LongCollector implementing a "group by" operation on
input numbers, grouping them according to a classification function, and
returning the results in a Map.
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static <K,D,A,M extends Map<K,D>>
LongCollector<?,M> |
LongCollector.groupingBy(LongFunction<? extends K> classifier,
Supplier<M> mapFactory,
LongCollector<A,D> downstream) |
Returns a LongCollector implementing a cascaded "group by"
operation on input numbers, grouping them according to a classification
function, and then performing a reduction operation on the values
associated with a given key using the specified downstream
IntCollector.
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static <K,D,A>
LongCollector<?,Map<K,D>> |
LongCollector.groupingBy(LongFunction<? extends K> classifier,
LongCollector<A,D> downstream) |
Returns a LongCollector implementing a cascaded "group by"
operation on input numbers, grouping them according to a classification
function, and then performing a reduction operation on the values
associated with a given key using the specified downstream
IntCollector.
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static LongCollector<?,String> |
LongCollector.joining(CharSequence delimiter) |
Returns a LongCollector that converts the input numbers to
strings and concatenates them, separated by the specified delimiter, in
encounter order.
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static LongCollector<?,String> |
LongCollector.joining(CharSequence delimiter,
CharSequence prefix,
CharSequence suffix) |
Returns a LongCollector that converts the input numbers to
strings and concatenates them, separated by the specified delimiter, with
the specified prefix and suffix, in encounter order.
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static <A,R>
LongCollector<?,R> |
LongCollector.mapping(LongUnaryOperator mapper,
LongCollector<A,R> downstream) |
Adapts a LongCollector to another one by applying a mapping
function to each input element before accumulation.
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static <U,A,R>
LongCollector<?,R> |
LongCollector.mappingToObj(LongFunction<U> mapper,
Collector<U,A,R> downstream) |
Adapts a Collector accepting elements of type U to a
LongCollector by applying a mapping function to each input
element before accumulation. |
static LongCollector<?,OptionalLong> |
LongCollector.max() |
Returns a LongCollector that produces the maximal element,
described as an OptionalLong. |
static LongCollector<?,OptionalLong> |
LongCollector.min() |
Returns a LongCollector that produces the minimal element,
described as an OptionalLong. |
static <A,R>
LongCollector<A,R> |
LongCollector.of(Supplier<A> supplier,
ObjLongConsumer<A> longAccumulator,
BiConsumer<A,A> merger,
Function<A,R> finisher) |
Returns a new LongCollector described by the given
supplier, accumulator, merger, and
finisher functions.
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static <R> LongCollector<R,R> |
LongCollector.of(Supplier<R> supplier,
ObjLongConsumer<R> longAccumulator,
BiConsumer<R,R> merger) |
Returns a new LongCollector described by the given
supplier, accumulator, and merger functions.
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static <A,R>
LongCollector<?,R> |
LongCollector.of(Collector<Long,A,R> collector) |
Adapts a Collector which accepts elements of type Long to
a LongCollector.
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static LongCollector<?,Map<Boolean,long[]>> |
LongCollector.partitioningBy(LongPredicate predicate) |
Returns a LongCollector which partitions the input elements
according to a LongPredicate, and organizes them into a
Map<Boolean, long[]>.
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static <A,D>
LongCollector<?,Map<Boolean,D>> |
LongCollector.partitioningBy(LongPredicate predicate,
LongCollector<A,D> downstream) |
Returns a LongCollector which partitions the input numbers
according to a LongPredicate, reduces the values in each
partition according to another IntCollector, and organizes them
into a Map<Boolean, D> whose values are the result of the
downstream reduction.
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static LongCollector<?,Long> |
LongCollector.reducing(long identity,
LongBinaryOperator op) |
Returns a LongCollector which performs a reduction of its input
numbers under a specified IntBinaryOperator using the provided
identity.
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static LongCollector<?,OptionalLong> |
LongCollector.reducing(LongBinaryOperator op) |
Returns a LongCollector which performs a reduction of its input
numbers under a specified LongBinaryOperator. |
static LongCollector<?,LongSummaryStatistics> |
LongCollector.summarizing() |
Returns a LongCollector which returns summary statistics for the
input elements.
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static LongCollector<?,Long> |
LongCollector.summing() |
Returns a LongCollector that produces the sum of the input
elements.
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static LongCollector<?,long[]> |
LongCollector.toArray() |
Returns a LongCollector that produces the array of the input
elements.
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static LongCollector<?,boolean[]> |
LongCollector.toBooleanArray(LongPredicate predicate) |
Returns a LongCollector which produces a boolean array containing
the results of applying the given predicate to the input elements, in
encounter order.
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