How to Monitor a Change in an Array

I have a class called Array, and this class is just able to add or remove an Object to/from the array.
But I need to automatically increase the size of the array when a new Object is inserted to the array with full capacity. And I don't want to change any codes for current add and remove methods. So to do this, I think I have to be constantly monitoring the changes in the array somehow. How do I do this?
Thank you.

Is this for a class, and are you prevented from using ArrayList or other classes from the Collections group?

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