ArrayList
ArrayList is a resizable array implementation of the List interface in Java, part of the Java Collections Framework. It provides dynamic array-like functionality, allowing elements to be added, removed, and accessed by index, with automatic resizing as needed. It is widely used for storing and manipulating ordered collections of objects in Java applications.
Developers should learn ArrayList when working with Java to handle collections that require frequent access by index and moderate insertion/deletion operations, as it offers O(1) time complexity for random access. It is ideal for use cases like caching data, implementing lists in user interfaces, or managing datasets where order matters but size changes dynamically, such as in data processing pipelines or inventory systems.