added in API level 24

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(Object).

See also:

Summary

Public methods

static <T> UnaryOperator<T> identity()

Returns a unary operator that always returns its input argument.

Inherited methods

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