Module java.base

Package java.util.function

Interface UnaryOperator<T>

Type Parameters:

T - the type of the operand and result of the operator

All Superinterfaces:

Function<T,T>

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 UnaryOperator<T>
extends Function<T,T>

Represents an operation on a single operand that produces a result of the same type as its operand. This is a specialization of Function for the case where the operand and result are of the same type.

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

Since:

1.8

See Also:

• Function

Method Summary

Static Methods

Modifier and Type	Method	Description
static <T> UnaryOperator<T>	identity()	Returns a unary operator that always returns its input argument.

Methods declared in interface java.util.function.Function

andThen, apply, compose

Method Details

identity

static <T> UnaryOperator<T> identity()

Returns a unary operator that always returns its input argument.

Type Parameters:

T - the type of the input and output of the operator

Returns:

a unary operator that always returns its input argument