Primitive Supplier Interfaces in Java: IntSupplier, LongSupplier, and DoubleSupplier

1. Introduction to Primitive Supplier Interfaces

Hello everyone, welcome back! In this blog post, we’re going to talk about the primitive supplier interfaces in Java: IntSupplier, LongSupplier, and DoubleSupplier. These interfaces are part of Java’s functional programming toolkit, specifically designed to work with primitive types (int, long, double). They help avoid the overhead caused by autoboxing, making your code more efficient. Let’s dive into what these interfaces are and how they can help optimize your code.

You can read this article for free on my blog: IntSupplier, LongSupplier, and DoubleSupplier in Java.

2. What is Autoboxing?

Before we get into the primitive supplier interfaces, let’s briefly discuss autoboxing. Autoboxing occurs when Java automatically converts primitive types like int, long, and double into their corresponding wrapper classes: Integer, Long, and Double. While this is convenient, it introduces performance overhead by consuming more memory and requiring extra processing.

2.1 Example: Autoboxing with Supplier<Integer>

import java.util.function.Supplier;

public class AutoboxingExample {

    public static void main(String[] args) {
        // Supplier<Integer> causes autoboxing
        Supplier<Integer> randomValue = () -> (int)…