Module java.base
Package 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

    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

  • 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