Collections Utility Class

java.util.Collections is a class full of static helper methods that act on the collections you already have. It doesn't define a new collection type. Instead, it gives you ready-made operations like sorting a product list, finding the cheapest item, shuffling recommendations, or grabbing a single-element list, so you don't have to write that code yourself. This lesson walks through the methods you'll actually use day to day, grouped by what they do.