Vanilla Java

Introduction Have you ever considered the performance implications of converting collections to arrays in Java? It's a common task; your chosen method can impact your application's efficiency. In this article, I will explore different approaches to toArray() , benchmark their performance, and determine which method is optimal for various scenarios. The Challenge Converting a Collection to an array seems straightforward, but the standard practice of using collection.toArray(new Type[0]) might not be the most efficient. Understanding the nuances of this method can help you write more performant code. Exploring the Approaches Let's delve into four primary methods and a combination for converting collections to arrays: 1. Using toArray() Without Arguments Object[] array = { "Hello", "world" }; String[] strings = (String[]) array; // Throws ClassCastException at runtime While this approach avoids additional array creation and can be fast, it ...