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LongToIntFunction 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 gives an int-valued result. The lambda expression assigned to an object of DoubleToLongFunction 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, Integer>. The LongToIntFunction interface has only one function:

This method accepts a long-valued argument and gives an int-valued result.

int applyAsInt(long value)

This method takes in one parameter

which is the long-valued argument.

This method returns an

result. Below is the code to illustrate applyAsInt() method:

// Java Program to demonstrate
// LongToIntFunction's applyAsInt() method

import java.util.function.LongToIntFunction;

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

        // Instantiating LongToIntFunction
        LongToIntFunction ob = a -> (int)a * 100000;

        // Applying the above function
        // using applyAsInt()
        System.out.println(ob.applyAsInt(2));
    }
}

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