Uses of Interface java.util.function.DoubleBinaryOperator (Java Platform SE 8 )
Date: 2026-04-17

## Uses of Interface
java.util.function.DoubleBinaryOperator

- Packages that use DoubleBinaryOperator
  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.

- - ### Uses of DoubleBinaryOperator in java.util

    Methods in java.util with parameters of type DoubleBinaryOperator
    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.

  - ### Uses of DoubleBinaryOperator in java.util.concurrent

    Methods in java.util.concurrent with parameters of type DoubleBinaryOperator
    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.

  - ### Uses of DoubleBinaryOperator in java.util.concurrent.atomic

    Constructors in java.util.concurrent.atomic with parameters of type DoubleBinaryOperator
    Constructor and Description
    `DoubleAccumulator(DoubleBinaryOperator accumulatorFunction, double identity)` Creates a new instance using the given accumulator function and identity element.

  - ### Uses of DoubleBinaryOperator in java.util.stream

    Methods in java.util.stream with parameters of type DoubleBinaryOperator
    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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