UnaryOperator

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

All Methods

Static Methods

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

Methods inherited from interface java.util.function.Function
andThen, apply, compose

- Method Detail
  - identity
```
static <T> UnaryOperator<T> identity()
```
    Returns a unary operator that always returns its input argument.
    
    Specified by:
    
    identity in interface Function<T,T>
    
    Type Parameters:
    
    T - the type of the input and output of the operator
    
    Returns:
    
    a unary operator that always returns its input argument