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 Function

andThen, apply, compose

Modifier and Type	Method	Description
default <V> Function<T,V>	andThen(Function<? super T, ? extends V> after)	Returns a composed function that first applies this function to its input, and then applies the after function to the result.
T	apply(T t)	Applies this function to the given argument.
default <V> Function<V,T>	compose(Function<? super V, ? extends T> before)	Returns a composed function that first applies the before function to its input, and then applies this function to the result.

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