# Uses of Interface
java.util.function.BinaryOperator

Packages that use BinaryOperator
Package | Description
--- | ---
java.util | Contains the collections framework, some internationalization support classes, a service loader, properties, random number generation, string parsing and scanning classes, base64 encoding and decoding, a bit array, and several miscellaneous utility classes.
java.util.concurrent.atomic | A small toolkit of classes that support lock-free thread-safe programming on single variables.
java.util.function | Functional interfaces provide target types for lambda expressions and method references.
java.util.stream | Classes to support functional-style operations on streams of elements, such as map-reduce transformations on collections.

## Uses of BinaryOperator in java.util

Methods in java.util with parameters of type BinaryOperator
Modifier and Type | Method | Description
--- | --- | ---
`static <T> void` | Arrays.`parallelPrefix​(T[] array, int fromIndex, int toIndex, BinaryOperator<T> op)` | Performs `Arrays.parallelPrefix(Object[], BinaryOperator)` for the given subrange of the array.
`static <T> void` | Arrays.`parallelPrefix​(T[] array, BinaryOperator<T> op)` | Cumulates, in parallel, each element of the given array in place, using the supplied function.

## Uses of BinaryOperator in java.util.concurrent.atomic

Methods in java.util.concurrent.atomic with parameters of type BinaryOperator
Modifier and Type | Method | Description
--- | --- | ---
`V` | AtomicReference.`accumulateAndGet​(V x, BinaryOperator<V> accumulatorFunction)` | Atomically updates (with memory effects as specified by `VarHandle.compareAndSet(java.lang.Object...)`) the current value with the results of applying the given function to the current and given values, returning the updated value.
`E` | AtomicReferenceArray.`accumulateAndGet​(int i, E x, BinaryOperator<E> accumulatorFunction)` | Atomically updates (with memory effects as specified by `VarHandle.compareAndSet(java.lang.Object...)`) the element at index `i` with the results of applying the given function to the current and given values, returning the updated value.
`V` | AtomicReferenceFieldUpdater.`accumulateAndGet​(T obj, V x, BinaryOperator<V> accumulatorFunction)` | Atomically updates (with memory effects as specified by `VarHandle.compareAndSet(java.lang.Object...)`) the field of the given object managed by this updater with the results of applying the given function to the current and given values, returning the updated value.
`V` | AtomicReference.`getAndAccumulate​(V x, BinaryOperator<V> accumulatorFunction)` | Atomically updates (with memory effects as specified by `VarHandle.compareAndSet(java.lang.Object...)`) the current value with the results of applying the given function to the current and given values, returning the previous value.
`E` | AtomicReferenceArray.`getAndAccumulate​(int i, E x, BinaryOperator<E> accumulatorFunction)` | Atomically updates (with memory effects as specified by `VarHandle.compareAndSet(java.lang.Object...)`) the element at index `i` with the results of applying the given function to the current and given values, returning the previous value.
`V` | AtomicReferenceFieldUpdater.`getAndAccumulate​(T obj, V x, BinaryOperator<V> accumulatorFunction)` | Atomically updates (with memory effects as specified by `VarHandle.compareAndSet(java.lang.Object...)`) the field of the given object managed by this updater with the results of applying the given function to the current and given values, returning the previous value.

## Uses of BinaryOperator in java.util.function

Methods in java.util.function that return BinaryOperator
Modifier and Type | Method | Description
--- | --- | ---
`static <T> BinaryOperator<T>` | BinaryOperator.`maxBy​(Comparator<? super T> comparator)` | Returns a `BinaryOperator` which returns the greater of two elements according to the specified `Comparator`.
`static <T> BinaryOperator<T>` | BinaryOperator.`minBy​(Comparator<? super T> comparator)` | Returns a `BinaryOperator` which returns the lesser of two elements according to the specified `Comparator`.

## Uses of BinaryOperator in java.util.stream

Methods in java.util.stream that return BinaryOperator
Modifier and Type | Method | Description
--- | --- | ---
`BinaryOperator<A>` | Collector.`combiner()` | A function that accepts two partial results and merges them.

Methods in java.util.stream with parameters of type BinaryOperator
Modifier and Type | Method | Description
--- | --- | ---
`static <T,​ A,​ R> Collector<T,​A,​R>` | Collector.`of​(Supplier<A> supplier, BiConsumer<A,​T> accumulator, BinaryOperator<A> combiner, Function<A,​R> finisher, Collector.Characteristics... characteristics)` | Returns a new `Collector` described by the given `supplier`, `accumulator`, `combiner`, and `finisher` functions.
`static <T,​ R> Collector<T,​R,​R>` | Collector.`of​(Supplier<R> supplier, BiConsumer<R,​T> accumulator, BinaryOperator<R> combiner, Collector.Characteristics... characteristics)` | Returns a new `Collector` described by the given `supplier`, `accumulator`, and `combiner` functions.
`Optional<T>` | Stream.`reduce​(BinaryOperator<T> accumulator)` | Performs a reduction on the elements of this stream, using an associative accumulation function, and returns an `Optional` describing the reduced value, if any.
`T` | Stream.`reduce​(T identity, BinaryOperator<T> accumulator)` | Performs a reduction on the elements of this stream, using the provided identity value and an associative accumulation function, and returns the reduced value.
`<U> U` | Stream.`reduce​(U identity, BiFunction<U,​? super T,​U> accumulator, BinaryOperator<U> combiner)` | Performs a reduction on the elements of this stream, using the provided identity, accumulation and combining functions.
`static <T> Collector<T,​?,​Optional<T>>` | Collectors.`reducing​(BinaryOperator<T> op)` | Returns a `Collector` which performs a reduction of its input elements under a specified `BinaryOperator`.
`static <T> Collector<T,​?,​T>` | Collectors.`reducing​(T identity, BinaryOperator<T> op)` | Returns a `Collector` which performs a reduction of its input elements under a specified `BinaryOperator` using the provided identity.
`static <T,​ U> Collector<T,​?,​U>` | Collectors.`reducing​(U identity, Function<? super T,​? extends U> mapper, BinaryOperator<U> op)` | Returns a `Collector` which performs a reduction of its input elements under a specified mapping function and `BinaryOperator`.
`static <T,​ K,​ U> Collector<T,​?,​ConcurrentMap<K,​U>>` | Collectors.`toConcurrentMap​(Function<? super T,​? extends K> keyMapper, Function<? super T,​? extends U> valueMapper, BinaryOperator<U> mergeFunction)` | Returns a concurrent `Collector` that accumulates elements into a `ConcurrentMap` whose keys and values are the result of applying the provided mapping functions to the input elements.

`static <T,​ K,​ U,​ M extends ConcurrentMap<K,​ U>>
Collector<T,​?,​M>`

Collectors.`toConcurrentMap​(Function<? super T,​? extends K> keyMapper, Function<? super T,​? extends U> valueMapper, BinaryOperator<U> mergeFunction, Supplier<M> mapFactory)`

Returns a concurrent `Collector` that accumulates elements into a `ConcurrentMap` whose keys and values are the result of applying the provided mapping functions to the input elements.

`static <T,​ K,​ U> Collector<T,​?,​Map<K,​U>>` | Collectors.`toMap​(Function<? super T,​? extends K> keyMapper, Function<? super T,​? extends U> valueMapper, BinaryOperator<U> mergeFunction)` | Returns a `Collector` that accumulates elements into a `Map` whose keys and values are the result of applying the provided mapping functions to the input elements.
`static <T,​ K,​ U,​ M extends Map<K,​ U>> Collector<T,​?,​M>` | Collectors.`toMap​(Function<? super T,​? extends K> keyMapper, Function<? super T,​? extends U> valueMapper, BinaryOperator<U> mergeFunction, Supplier<M> mapFactory)` | Returns a `Collector` that accumulates elements into a `Map` whose keys and values are the result of applying the provided mapping functions to the input elements.
`static <T,​ K,​ U> Collector<T,​?,​Map<K,​U>>` | Collectors.`toUnmodifiableMap​(Function<? super T,​? extends K> keyMapper, Function<? super T,​? extends U> valueMapper, BinaryOperator<U> mergeFunction)` | Returns a `Collector` that accumulates the input elements into an unmodifiable Map, whose keys and values are the result of applying the provided mapping functions to the input elements.