Uses of Interface
java8.util.function.ToLongFunction

Packages that use ToLongFunction

Package	Description
java8.util	Provides some of the new java.util classes and implementations of static and default interface methods added in Java 8 and, in addition, the JEP 269: Convenience Factory Methods for Collections that were introduced in Java 9.
java8.util.stream	Classes to support functional-style operations on streams of elements, such as map-reduce transformations on collections.

Uses of ToLongFunction in java8.util

Methods in java8.util with parameters of type ToLongFunction

Modifier and Type	Method and Description
static <T> Comparator<T>	Comparators.comparingLong(ToLongFunction<? super T> keyExtractor) Accepts a function that extracts a long sort key from a type T, and returns a Comparator<T> that compares by that sort key.
static <T> Comparator<T>	Comparators.thenComparingLong(Comparator<? super T> this_, ToLongFunction<? super T> keyExtractor) Returns a lexicographic-order comparator with a function that extracts a long sort key.

Uses of ToLongFunction in java8.util.stream

Methods in java8.util.stream with parameters of type ToLongFunction

Modifier and Type	Method and Description
static <T> Collector<T,?,Double>	Collectors.averagingLong(ToLongFunction<? super T> mapper) Returns a Collector that produces the arithmetic mean of a long-valued function applied to the input elements.
LongStream	Stream.mapToLong(ToLongFunction<? super T> mapper) Returns a LongStream consisting of the results of applying the given function to the elements of this stream.
static <T> Collector<T,?,LongSummaryStatistics>	Collectors.summarizingLong(ToLongFunction<? super T> mapper) Returns a Collector which applies an long-producing mapping function to each input element, and returns summary statistics for the resulting values.
static <T> Collector<T,?,Long>	Collectors.summingLong(ToLongFunction<? super T> mapper) Returns a Collector that produces the sum of a long-valued function applied to the input elements.