Java IntSupplier

Introduction

In Java, the IntSupplier interface is a functional interface that represents a supplier of int-valued results. It is part of the java.util.function package and is used to generate or supply an int value without any input.

Table of Contents

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

1. What is IntSupplier?

IntSupplier is a functional interface that provides an int result when called. It is commonly used in scenarios where a constant or calculated int value needs to be supplied on demand.

2. Methods and Syntax

The main method in the IntSupplier interface is:

• int getAsInt(): Gets an int result.

Syntax

IntSupplier intSupplier = () -> {
    // logic to return an int value
    return result;
};

3. Examples of IntSupplier

Example 1: Returning a Constant Value

import java.util.function.IntSupplier;

public class ConstantIntSupplier {
    public static void main(String[] args) {
        // Define an IntSupplier that returns a constant value
        IntSupplier constantValue = () -> 42;

        int result = constantValue.getAsInt();
        System.out.println("Constant Value: " + result);
    }
}

Output:

Constant Value: 42

Example 2: Generating a Random Integer

import java.util.function.IntSupplier;

public class RandomIntSupplier {
    public static void main(String[] args) {
        // Define an IntSupplier that returns a random integer
        IntSupplier randomValue = () -> (int) (Math.random() * 100);

        int result = randomValue.getAsInt();
        System.out.println("Random Value: " + result);
    }
}

Output:

Random Value: [Random number between 0 and 99]

4. Real-World Use Case: Supplying Sensor Data

In monitoring systems, IntSupplier can be used to supply sensor readings, such as temperature or pressure.

import java.util.function.IntSupplier;

public class SensorDataSupplier {
    public static void main(String[] args) {
        // Define an IntSupplier to simulate sensor readings
        IntSupplier temperatureReading = () -> getTemperature();

        int temperature = temperatureReading.getAsInt();
        System.out.println("Current Temperature: " + temperature);
    }

    // Simulated method to get temperature
    private static int getTemperature() {
        // Logic to retrieve temperature data, e.g., from a sensor
        return 25; // Assume a constant temperature for this example
    }
}

Output:

Current Temperature: 25

Conclusion

The IntSupplier interface is used in Java for providing int values without any input parameters. It is particularly beneficial in scenarios like generating constant values, random numbers, or sensor data. Using IntSupplier can help create modular and reusable code, especially in functional programming contexts.