BinaryOperator

AI-generated Key Takeaways

• BinaryOperator is a functional interface representing an operation on two operands of the same type, producing a result of the same type.

• It is a specialization of BiFunction where the operands and result share the same type.

• BinaryOperator provides methods like maxBy and minBy to find the greater or lesser of two elements based on a Comparator.

• The core functionality is inherited from BiFunction with the apply method to execute the operation.

public interface BinaryOperator implements BiFunction<T, T, T>

Represents an operation upon two operands of the same type, producing a result of the same type as the operands. This is a specialization of BiFunction for the case where the operands and the result are all of the same type.

This is a functional interface whose functional method is BiFunction.apply(Object, Object).

See Also

• BiFunction
• UnaryOperator

Public Method Summary

static <T> BinaryOperator<T>	maxBy(Comparator<? super T> comparator) Returns a BinaryOperator which returns the greater of two elements according to the specified Comparator.
static <T> BinaryOperator<T>	minBy(Comparator<? super T> comparator) Returns a BinaryOperator which returns the lesser of two elements according to the specified Comparator.

Inherited Method Summary

From interface java.util.function.BiFunction

<V> BiFunction<T, T, V>	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.
abstract T	apply(T t, T u) Applies this function to the given arguments.

Public Methods

public static BinaryOperator<T> maxBy (Comparator<? super T> comparator)

Returns a BinaryOperator which returns the greater of two elements according to the specified Comparator.

Parameters

comparator	a Comparator for comparing the two values

Returns

• a BinaryOperator which returns the greater of its operands, according to the supplied Comparator

Throws

NullPointerException	if the argument is null

public static BinaryOperator<T> minBy (Comparator<? super T> comparator)

Returns a BinaryOperator which returns the lesser of two elements according to the specified Comparator.

Parameters

comparator	a Comparator for comparing the two values

Returns

• a BinaryOperator which returns the lesser of its operands, according to the supplied Comparator

Throws

NullPointerException	if the argument is null