How to implement ArrayList with Array in Java With Examples

ArrayList is the most popular implementation of List in java.

ArrayList is very similar to Array but provides the feature of dynamic space allocation when the number of objects in the list grows.

In Array, we have to provide the size at the time of initialization but that is not required for ArrayList.

Actually, when you initialize ArrayList, it automatically assigns its initial capacity to 10.

Implement ArrayList using Array

ArrayList is implemented on top of array. Here I am trying to implement custom ArrayList with an Array and provide basic functions such as get(index), add(object) and remove(index).

This is the basic implementation of ArrayList using an Array. The idea is to understand how an ArrayList is implemented. For development purposes, use the ArrayList class from the Collections API.


Below is the output produced when we execute the above program.


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