Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://www.geeksforgeeks.org/java/unaryoperator-interface-in-java/ below:

UnaryOperator Interface in Java - GeeksforGeeks

Last Updated : 11 Jul, 2025

The

is a part of the

package which has been introduced since Java 8, to implement

It represents a function which takes in one argument and operates on it. However what distinguishes it from a normal Function is that both its argument and return type are the same. Hence this functional interface which takes in one generic namely:-

• T: denotes the type of the input argument to the operation

Hence the UnaryOperator<T> overloads the Function<T, T> type. So it inherits the following methods from the Function Interface:

• T apply(T t)
• default <V> Function<T, V> andThen(Function<? super R, ? extends V> after)
• default <V> Function<V, R> compose(Function<? super V, ? extends T> before)

The lambda expression assigned to an object of UnaryOperator type is used to define its

which eventually applies the given operation on its argument.

The UnaryOperator interface consists of the following functions:

This method returns a UnaryOperator which takes in one value and returns it. The returned UnaryOperator does not perform any operation on its only value.

static  UnaryOperator identity()

This method does not take in any parameter.

A UnaryOperator which takes in one value and returns it. Below is the code to illustrate accept() method:

import java.util.function.UnaryOperator;

public class GFG {
    public static void main(String args[])
    {

        // Instantiate the UnaryOperator interface
        UnaryOperator<Boolean>
            op = UnaryOperator.identity();

        // Apply identify() method
        System.out.println(op.apply(true));
    }
}

import java.util.function.Function;
import java.util.function.UnaryOperator;

public class GFG {
    public static void main(String args[])
    {
        UnaryOperator<Integer> xor = a -> a ^ 1;
        System.out.println(xor.apply(2));
    }
}

import java.util.function.Function;
import java.util.function.UnaryOperator;

public class GFG {
    public static void main(String args[])
    {
        UnaryOperator<Integer> xor = a -> a ^ 1;
        UnaryOperator<Integer> and = a -> a & 1;
        Function<Integer, Integer> compose = xor.andThen(and);
        System.out.println(compose.apply(2));
    }
}

import java.util.function.Function;
import java.util.function.UnaryOperator;

public class GFG {
    public static void main(String args[])
    {
        UnaryOperator<Integer> xor = a -> a ^ 1;
        UnaryOperator<Integer> and = a -> a & 1;
        Function<Integer, Integer> compose = xor.compose(and);
        System.out.println(compose.apply(231));
    }
}

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4