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Added in API level 24

IntUnaryOperator

@FunctionalInterface interface IntUnaryOperator

java.util.function.IntUnaryOperator

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

This is a functional interface whose functional method is applyAsInt(int).

Summary

Public methods
open IntUnaryOperator!	`andThen(after: IntUnaryOperator!)` Returns a composed operator that first applies this operator to its input, and then applies the `after` operator to the result.
abstract Int	`applyAsInt(operand: Int)` Applies this operator to the given operand.
open IntUnaryOperator!	`compose(before: IntUnaryOperator!)` Returns a composed operator that first applies the `before` operator to its input, and then applies this operator to the result.
open static IntUnaryOperator!	`identity()` Returns a unary operator that always returns its input argument.

Public methods

andThen

Added in API level 24

open fun andThen(after: IntUnaryOperator!): IntUnaryOperator!

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`	IntUnaryOperator!: the operator to apply after this operator is applied

Return
`IntUnaryOperator!`	a composed operator that first applies this operator and then applies the `after` operator

Exceptions
`java.lang.NullPointerException`	if after is null

See Also

#compose(java.util.function.IntUnaryOperator)

applyAsInt

Added in API level 24

abstract fun applyAsInt(operand: Int): Int

Applies this operator to the given operand.

Parameters
`operand`	Int: the operand

Return
`Int`	the operator result

compose

Added in API level 24

open fun compose(before: IntUnaryOperator!): IntUnaryOperator!

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`	IntUnaryOperator!: the operator to apply before this operator is applied

Return
`IntUnaryOperator!`	a composed operator that first applies the `before` operator and then applies this operator

Exceptions
`java.lang.NullPointerException`	if before is null

See Also

#andThen(java.util.function.IntUnaryOperator)

identity

Added in API level 24

open static fun identity(): IntUnaryOperator!

Returns a unary operator that always returns its input argument.

Return
`IntUnaryOperator!`	a unary operator that always returns its input argument

Content and code samples on this page are subject to the licenses described in the Content License. Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.

Last updated 2026-02-26 UTC.

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