Interface DoubleUnaryOperator

All Superinterfaces:

DoubleUnaryOperator, Function<Double,Double>, UnaryOperator<Double>

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface DoubleUnaryOperator
extends UnaryOperator<Double>, DoubleUnaryOperator

A type-specific UnaryOperator; provides methods operating both on objects and on primitives.

Since:

8.5.0

See Also:

• UnaryOperator

Method Summary

Modifier and Type	Method	Description
double	apply(double x)	Computes the operator on the given input.
default Double	apply(Double x)	Deprecated. Please use the corresponding type-specific method instead.
default double	applyAsDouble(double x)	Deprecated. Please use apply(double).
static DoubleUnaryOperator	identity()	Returns a UnaryOperator that always returns the input unmodified.
static DoubleUnaryOperator	negation()	Returns a UnaryOperator that always returns the arithmetic negation of the input.

Methods inherited from interface java.util.function.DoubleUnaryOperator

andThen, compose

Methods inherited from interface java.util.function.Function

andThen, compose

Method Details

apply

double apply(double x)

Computes the operator on the given input.

Parameters:

x - the input.

Returns:

the output of the operator on the given input.

identity

static DoubleUnaryOperator identity()

Returns a UnaryOperator that always returns the input unmodified.

See Also:

• UnaryOperator.identity()

negation

static DoubleUnaryOperator negation()

Returns a UnaryOperator that always returns the arithmetic negation of the input.

Implementation Notes:

As with all negation, be wary of unexpected behavior near the minimum value of the data type. For example, -Integer.MIN_VALUE will result in Integer.MIN_VALUE (still negative), as the positive value of Integer.MIN_VALUE is too big for int (it would be 1 greater then Integer.MAX_VALUE).

applyAsDouble

@Deprecated
default double applyAsDouble(double x)

Deprecated.

Please use apply(double).

Specified by:

applyAsDouble in interface DoubleUnaryOperator

Implementation Specification:

This default implementation delegates to apply(double).

apply

@Deprecated
default Double apply(Double x)

Deprecated.

Please use the corresponding type-specific method instead.

Specified by:

apply in interface Function<Double,Double>