Viewing: docs.oracle.com

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

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

- Method Detail
  - 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

Report a bug or suggest an enhancement
For further API reference and developer documentation see the Java SE Documentation, which contains more detailed, developer-targeted descriptions with conceptual overviews, definitions of terms, workarounds, and working code examples.
Java is a trademark or registered trademark of Oracle and/or its affiliates in the US and other countries.
Copyright © 1993, 2025, Oracle and/or its affiliates, 500 Oracle Parkway, Redwood Shores, CA 94065 USA.
All rights reserved. Use is subject to license terms and the documentation redistribution policy.

Interface UnaryOperator<T>

Method Summary

Methods declared in interface java.util.function.Function

Method Detail

identity