Learn Programming in Java - Collections

Collections: (Java 8 above) a comprehensive set of classes and interfaces designed to handle collections of data. Providing a standard way to manage groups of objects and includes utilities for data manipulation like sorting, searching, and iterating. With Java 8, the inclusion of functional programming features has made it more versatile.

Core Concepts:
* Interfaces: Define the abstract data types, where Collection is the root for most.
* Implementations: Concrete classes that implement the above ArrayList and Set.
* Utility Classes: Provide static methods for common usages and manipulation scenarios.