The java.util package contains the Collections class in Java . The Java Collections class is used with the static methods that operate on the collections or return the collection. Explore Java Collections with this complete guide! Learn interfaces, implementations, Stream API, custom collections , and real-world examples for efficient coding. Explore the Java Collection Framework with this in-depth guide. Learn about Lists, Sets, Maps, and Queues, their implementations, and how to optimize data handling in Java. Java provides built-in collection classes like List, Set, Map and Queue, so developers don’t need to write their own data management algorithms. The Collection Framework improves productivity by making code more reusable, maintainable and faster to develop.