## Introduction

In Java, the `BinaryOperator` interface is a functional interface that extends `BiFunction` and operates on two operands of the same type, returning a result of the same type. It is part of the `java.util.function` package and is commonly used for operations like arithmetic or combining elements.

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

## 1. What is BinaryOperator?

`BinaryOperator` is a specialization of `BiFunction` for cases where both operands and the result are of the same type. It's often used in mathematical computations and list reductions.

## 2. Methods and Syntax

The main method in the `BinaryOperator` interface is:

• `T apply(T t1, T t2)`: Applies this operator to the given operands and returns the result.

### Syntax

``````BinaryOperator<T> binaryOperator = (T t1, T t2) -> {
// operation on t1 and t2
return result;
};
``````

## 3. Examples of BinaryOperator

### Example 1: Adding Two Numbers

``````import java.util.function.BinaryOperator;

public class BinaryOperatorExample {
public static void main(String[] args) {
// Define a BinaryOperator that adds two integers
BinaryOperator<Integer> add = (a, b) -> a + b;

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

Output:

``````Sum: 8
``````

### Example 2: Finding Maximum of Two Numbers

``````import java.util.function.BinaryOperator;

public class MaxExample {
public static void main(String[] args) {
// Define a BinaryOperator to find the maximum of two integers
BinaryOperator<Integer> max = (a, b) -> a > b ? a : b;

Integer result = max.apply(10, 20);

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

Output:

``````Max: 20
``````

## 4. Real-World Use Case: Combining Discounts

In retail applications, `BinaryOperator` can be used to combine multiple discount rates.

``````import java.util.function.BinaryOperator;

public class DiscountCombiner {
public static void main(String[] args) {
// Define a BinaryOperator to combine two discount rates
BinaryOperator<Double> combineDiscounts = (d1, d2) -> d1 + d2 - (d1 * d2 / 100);

Double discount1 = 10.0;
Double discount2 = 5.0;

Double combinedDiscount = combineDiscounts.apply(discount1, discount2);

System.out.println("Combined Discount: " + combinedDiscount);
}
}
``````

Output:

``````Combined Discount: 14.5
``````

## Conclusion

The `BinaryOperator` interface is used in Java for operations that require two operands of the same type to produce a result of the same type. It is particularly beneficial in mathematical computations, list reductions, and scenarios involving combining similar data types. Using `BinaryOperator` can lead to cleaner and more efficient code in functional programming.