UnaryOperator

public interface UnaryOperator
implements Function<T, T>

java.util.function.UnaryOperator<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(java.lang.Object).

See also:

Function

Summary

Public methods
`static <T> UnaryOperator<T>`	`identity()` Returns a unary operator that always returns its input argument.

Inherited methods

From interface java.util.function.Function

`default <V> Function<T, V>`	`andThen(Function<? super R, ? extends V> after)` Returns a composed function that first applies this function to its input, and then applies the `after` function to the result.
`abstract 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.
`static <T> Function<T, T>`	`identity()` Returns a function that always returns its input argument.

Public methods

identity

Added in API level 24

 public static UnaryOperator<T> identity ()

Returns a unary operator that always returns its input argument.

Returns
`UnaryOperator<T>`	a unary operator that always returns its input argument