Java.util.function.DoubleBinaryOperator interface with Examples

In Java8, the DoubleBinaryOperator interface came into existence. It returns a double value as the final result of an operation on two double values that it represents. It can be used as a method reference or as a lambda expression because it is a functional interface. Generally, it is used in circumstances where the user must not be involved in the process.

The Method that can be implemented is:

applyAsDouble(): This function takes two double values, performs the required operation, and returns the result as a double.

Syntax:

Example 1:

The Java implementation mentioned below shows how to add elements in a DoubleStream by using streams and functional interfaces.

Implementation:

FileName: SumOperator.java

import java.util.stream.DoubleStream;
import java.util.function.DoubleBinaryOperator;
import java.io.*;
public class SumOperator 
{
    public static void main(String[] args) 
    {
        DoubleStream DS = DoubleStream.of(11.0, 12.0, 13.0, 14.0, 15.0);
        DoubleBinaryOperator operator = (left, right) -> left + right;
        // Start with 0.0 and use the reduction 
        // function to add up all of the stream's elements.
        double sumResult = DS.reduce(0.0, operator);
        System.out.println("The total sum of the elements is: " + sumResult);
    }
}

Output:

The total sum of the elements is: 65.0

Example 2:

Using two double values, p, and q, the supplied Java program shows how to execute fundamental arithmetic operations on them using the DoubleBinaryOperator interface. Each operation (addition, subtraction, multiplication, division, and modulo division) has a DoubleBinaryOperator lambda expression defined for it.

Implementation:

FileName: BinaryOperators.java

import java.util.function.DoubleBinaryOperator; 
import java.io.*;
public class BinaryOperators
{ 
    public static void main(String[] args) 
    { 
        double p = 70.00; 
        double q = 30.00; 
        // Using the double binary operator 
        // to symbolize addition 
        DoubleBinaryOperator doubleBinaryOperator = (a, b) -> a + b; 
        System.out.println("The sum is p + q = " + doubleBinaryOperator.applyAsDouble(p, q)); 
        // Using the double binary operator 
        // to symbolize subtraction 
        doubleBinaryOperator = (a, b) -> a - b; 
        System.out.println("The difference is p - q = " + doubleBinaryOperator.applyAsDouble(p, q)); 
        // Using the double binary operator 
        // to symbolize multiplication
        doubleBinaryOperator = (a, b) -> a * b; 
        System.out.println("The product is p * q = " + doubleBinaryOperator.applyAsDouble(p, q)); 
        // Using the double binary operator 
        // to symbolize division 
        doubleBinaryOperator = (a, b) -> a / b; 
        System.out.println("The division is p / q = " + doubleBinaryOperator.applyAsDouble(p, q)); 
        // Using the double binary operator 
        // to symbolize modulo division
        doubleBinaryOperator = (a, b) -> a % b; 
        System.out.println("The modulo division is p % q = " + doubleBinaryOperator.applyAsDouble(p, q)); 
    } 
}

Output:

The sum is p + q = 100.0
The difference is p - q = 40.0
The product is p * q = 2100.0
The division is p / q = 2.3333333333333335
The modulo division is p % q = 10.0

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