Скачать или смотреть Selenium automation testing course with Java- Collections -ArrayList- class 21

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Collections:-
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In Java, a Collection is a framework that provides a unified architecture to store, retrieve, and manipulate a group of objects. It is part of the Java Collections Framework (JCF) which is defined in the java.util package.

A collection is like a container that holds multiple data items together. Unlike arrays, which have fixed sizes and store elements of the same type, collections are dynamic and can hold objects of any type (using Generics).

What is an ArrayList in Java?
ArrayList is a resizable array implementation of the List interface in Java.
It is part of the Java Collections Framework, found in the java.util package.
Unlike a regular array in Java (which has a fixed size), an ArrayList can grow or shrink dynamically as elements are added or removed.
It allows duplicate elements, maintains insertion order, and supports index-based access.

Package :-
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import java.util.ArrayList;

ArrayList list = new ArrayList();

Dynamic Size Grows/shrinks automatically
Ordered Maintains insertion order
Allows Duplicates Can store duplicate elements
Indexed Access Access via get(index)
Non-synchronized Not thread-safe by default
Allows null Can store null values

methods inside ArrayList:-
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add(E e) Adds element at the end
add(int index, E e) Adds element at specific index
get(int index) Returns element at index
set(int index, E e) Replaces element
remove(int index) Removes element at index
size() Returns number of elements
clear() Removes all elements
contains(Object o) Checks if element exists
isEmpty() Returns true if list is empty