Added in API level 24

DoubleUnaryOperator

public interface DoubleUnaryOperator

java.util.function.DoubleUnaryOperator

---

Represents an operation on a single double-valued operand that produces a double-valued result. This is the primitive type specialization of UnaryOperator for double.

This is a functional interface whose functional method is applyAsDouble(double).

See also:

• UnaryOperator

Summary

Public methods
default DoubleUnaryOperator	andThen(DoubleUnaryOperator after) Returns a composed operator that first applies this operator to its input, and then applies the after operator to the result.
abstract double	applyAsDouble(double operand) Applies this operator to the given operand.
default DoubleUnaryOperator	compose(DoubleUnaryOperator before) Returns a composed operator that first applies the before operator to its input, and then applies this operator to the result.
static DoubleUnaryOperator	identity() Returns a unary operator that always returns its input argument.

Public methods

andThen

Added in API level 24

public DoubleUnaryOperator andThen (DoubleUnaryOperator after)

Returns a composed operator that first applies this operator to its input, and then applies the after operator to the result. If evaluation of either operator throws an exception, it is relayed to the caller of the composed operator.

Parameters
after	DoubleUnaryOperator: the operator to apply after this operator is applied

Returns
DoubleUnaryOperator	a composed operator that first applies this operator and then applies the after operator

Throws
NullPointerException	if after is null

See also:

• compose(DoubleUnaryOperator)

applyAsDouble

Added in API level 24

public abstract double applyAsDouble (double operand)

Applies this operator to the given operand.

Parameters
operand	double: the operand

Returns
double	the operator result

compose

Added in API level 24

public DoubleUnaryOperator compose (DoubleUnaryOperator before)

Returns a composed operator that first applies the before operator to its input, and then applies this operator to the result. If evaluation of either operator throws an exception, it is relayed to the caller of the composed operator.

Parameters
before	DoubleUnaryOperator: the operator to apply before this operator is applied

Returns
DoubleUnaryOperator	a composed operator that first applies the before operator and then applies this operator

Throws
NullPointerException	if before is null

See also:

• andThen(DoubleUnaryOperator)

identity

Added in API level 24

public static DoubleUnaryOperator identity ()

Returns a unary operator that always returns its input argument.

Returns
DoubleUnaryOperator	a unary operator that always returns its input argument