Uses of Interface
java.util.function.Function

Packages that use Function

Package	Description
java.util
java.util.function

Uses of Function in java.util

Methods in java.util with parameters of type Function

Modifier and Type	Method and Description
static <T,U extends Comparable<? super U>> Comparator<T>	Comparator.comparing(Function<? super T,? extends U> keyExtractor) Accepts a function that extracts a Comparable sort key from a type T, and returns a Comparator<T> that compares by that sort key.
static <T,U> Comparator<T>	Comparator.comparing(Function<? super T,? extends U> keyExtractor, Comparator<? super U> keyComparator) Accepts a function that extracts a sort key from a type T, and returns a Comparator<T> that compares by that sort key using the specified Comparator.
default V	Map.computeIfAbsent(K key, Function<? super K,? extends V> mappingFunction) If the specified key is not already associated with a value (or is mapped to null), attempts to compute its value using the given mapping function and enters it into this map unless null.
default <U extends Comparable<? super U>> Comparator<T>	Comparator.thenComparing(Function<? super T,? extends U> keyExtractor) Returns a lexicographic-order comparator with a function that extracts a Comparable sort key.
default <U> Comparator<T>	Comparator.thenComparing(Function<? super T,? extends U> keyExtractor, Comparator<? super U> keyComparator) Returns a lexicographic-order comparator with a function that extracts a key to be compared with the given Comparator.

Uses of Function in java.util.function

Subinterfaces of Function in java.util.function

Modifier and Type	Interface and Description
interface	UnaryOperator<T> Represents an operation on a single operand that produces a result of the same type as its operand.

Methods in java.util.function that return Function

Modifier and Type	Method and Description
default <V> Function<T,V>	Function.andThen(Function<? super R,? extends V> after) Returns a composed function that first applies this function to its input, and then applies the after function to the result.
default <V> Function<V,R>	Function.compose(Function<? super V,? extends T> before) Returns a composed function that first applies the before function to its input, and then applies this function to the result.
static <T> Function<T,T>	Function.identity() Returns a function that always returns its input argument.

Methods in java.util.function with parameters of type Function

Modifier and Type	Method and Description
default <V> Function<T,V>	Function.andThen(Function<? super R,? extends V> after) Returns a composed function that first applies this function to its input, and then applies the after function to the result.
default <V> BiFunction<T,U,V>	BiFunction.andThen(Function<? super R,? extends V> after) Returns a composed function that first applies this function to its input, and then applies the after function to the result.
default <V> Function<V,R>	Function.compose(Function<? super V,? extends T> before) Returns a composed function that first applies the before function to its input, and then applies this function to the result.