Collections - ArrayList with Iterator - Introduction

Arrays:

• Arrays are strongly typed. Hence only same type of elements can stored. (Ex. if “A” is an array, here we can store only integer or string or bool etc..).
• Since strongly typed, boxing and unboxing never happens. 
• These are fixed in size and will not grow dynamically runtime.
• To store and to retrieve we should use integral index.
• Array don’t support Add() and Remove() functions.

ArrayList:

• ArrayList are not strongly typed(Loosely typed).
• Since Loosely typed, boxing and unboxing happens which results in performance problem.
• They can grow dynamically while runtime.
• ArrayList provide sufficient methods to work with like Add().