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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

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Last updated 2026-08-03 UTC.

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