Array List

• Java ArrayList is a part of the Java collections framework

• Array list is useful for creating dynamic sized arrays;(dynamic sized arrays resize themself)

• We cannot directly use primitive data types in an ArrayList ; instead we can use wrapper class

 // Attempting to create an ArrayList of int (primitive type) - this will cause a compilation error
        ArrayList<int> numbers = new ArrayList<>();  // Error: int cannot be used as a type argument

• advantage of ArrayList is it is not neecessary to mention the size of ArrayList.

Difference between Array and ArrayList

Feature	Array	ArrayList
Size	Fixed	Dynamic
Data Type Support	Primitives & Objects	Objects only
Performance	Faster	Slightly slower due to resizing
Memory Efficiency	More efficient	Less efficient
Built-in Methods	Fewer	More (add, remove, etc.)
Use Case	Fixed-size data	Dynamic data