An Array List in Java is a dynamic, resizable array that implements the List interface. It allows for storing elements in a list, providing the ability to easily add, remove, or access items based on their index. Unlike arrays, ArrayList can grow or shrink in size as elements are added or removed.
Key features of ArrayList include:
Automatic resizing: It dynamically resizes when the capacity is exceeded.
Indexed access: You can access elements using the get() method.
Versatile methods: Methods like add(), remove(), contains(), and clear() make it easy to manage the list.
Flexible data types: It can store objects of any type, but requires wrapping primitive data types (e.g., int as Integer).
However, ArrayList is not thread-safe by default and is slower in certain operations compared to arrays. It is commonly used in scenarios where data can change dynamically and flexibility is needed.
