How to add multiple objects/atributes into an array?

Hi, I have a class that has lots of objects created as local variables (they could be attributes if needed). About 200 hundred or more. (Yes I know that’s a lot, but Initially i didn’t have plans to have more than 20...)

The problem is that now I want to create an ArrayList with all of them, I could just start adding one by one with the method .add but that will be a lot of work. Is there a way to get all the variables/attributes in one array automatically? How can I create such an array list without adding one by one separately?

Thanks.