Java.util.function.IntBinaryOperator interface with Examples

The IntBinaryOperator interface was introduced in Java 8. It represents an operation on two int values and returns the result as an int value. It is a functional interface and thus can be used as a lambda expression or in a method reference. It is mostly used when the operation needs to be encapsulated from the user.

Methods

1. applyAsInt(): This function takes two int values, performs the required operation and returns the result as an int.

   public int applyAsInt(int val1, int val2)
   

Example to demonstrate IntBinaryOperator interface as a lambda expression .

// Java program to demonstrate IntBinaryOperator

import java.util.function.IntBinaryOperator;

public class IntBinaryOperatorDemo {
    public static void main(String[] args)
    {
        // Binary operator defined to divide
        // factorial of two numbers
        IntBinaryOperator binaryOperator = (x, y) ->
        {
            int fact1 = 1;
            for (int i = 2; i <= x; i++) {
                fact1 *= i;
            }
            int fact2 = 1;
            for (int i = 2; i <= y; i++) {
                fact2 *= i;
            }
            return fact1 / fact2;
        };

        System.out.println("5! divided by 7! = "
                           + binaryOperator.applyAsInt(5, 7));
        System.out.println("7! divided by 5! = "
                           + binaryOperator.applyAsInt(7, 5));
    }
}

Output:

5! divided by 7! = 0
7! divided by 5! = 42

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/function/IntBinaryOperator.html