Java DoubleBinaryOperator

Introduction

In Java, the DoubleBinaryOperator interface is a functional interface that represents an operation upon two double operands, producing a double result. It is part of the java.util.function package and is commonly used for arithmetic operations involving two double values.

Table of Contents

1. What is DoubleBinaryOperator?
2. Methods and Syntax
3. Examples of DoubleBinaryOperator
4. Real-World Use Case
5. Conclusion

1. What is DoubleBinaryOperator?

DoubleBinaryOperator is a functional interface designed for operations on two double operands that return a double result. It simplifies mathematical computations in functional programming.

2. Methods and Syntax

The main method in the DoubleBinaryOperator interface is:

• double applyAsDouble(double left, double right): Applies the operator to the given operands and returns the result.

Syntax

DoubleBinaryOperator operator = (double left, double right) -> {
    // operation on left and right
    return result;
};

3. Examples of DoubleBinaryOperator

Example 1: Adding Two Numbers

import java.util.function.DoubleBinaryOperator;

public class AdditionExample {
    public static void main(String[] args) {
        // Define a DoubleBinaryOperator that adds two doubles
        DoubleBinaryOperator add = (a, b) -> a + b;

        double result = add.applyAsDouble(5.5, 3.2);

        System.out.println("Sum: " + result);
    }
}

Output:

Sum: 8.7

Example 2: Multiplying Two Numbers

import java.util.function.DoubleBinaryOperator;

public class MultiplicationExample {
    public static void main(String[] args) {
        // Define a DoubleBinaryOperator that multiplies two doubles
        DoubleBinaryOperator multiply = (a, b) -> a * b;

        double result = multiply.applyAsDouble(4.0, 2.5);

        System.out.println("Product: " + result);
    }
}

Output:

Product: 10.0

4. Real-World Use Case: Calculating Average

In financial applications, DoubleBinaryOperator can be used to calculate the average of two double values, such as prices or rates.

import java.util.function.DoubleBinaryOperator;

public class AverageCalculator {
    public static void main(String[] args) {
        // Define a DoubleBinaryOperator to calculate the average of two doubles
        DoubleBinaryOperator average = (a, b) -> (a + b) / 2;

        double averagePrice = average.applyAsDouble(20.5, 30.0);

        System.out.println("Average Price: " + averagePrice);
    }
}

Output:

Average Price: 25.25

Conclusion

The DoubleBinaryOperator interface is used in Java for performing operations on two double operands, returning a double result. It is particularly beneficial in scenarios involving mathematical computations, such as financial calculations or scientific applications. Using DoubleBinaryOperator can help create concise and readable code in functional programming contexts.