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LongFunction Interface in Java with Examples

Last Updated : 11 Jul, 2025

The

is a part of the

package which has been introduced since Java 8, to implement

in Java. It represents a function which takes in a long-valued argument and produces a result of type

. This functional interface takes in only one generic, namely:-

• R: denotes the type of the output of this function

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

which eventually applies the given operation on its only argument. It is similar to using an object of type

<Long, R>. The LongFunction interface has only one function:

This method accepts a long-valued argument and gives a result of type R.

R apply(long value)

This method takes in one parameter

which is a long-valued argument.

This method returns a value of type

. Below is the code to illustrate apply() method:

import java.util.function.LongFunction;

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

        LongFunction<Double> ob = a -> a / 2.0;

        // Using apply()
        System.out.println(ob.apply(3));
    }
}

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