Should I extend ArrayList to add attributes that isn't null?

Question

I would like to add a collection of objects to an arrayList ,only if the particular attribute is not null.

I am thinking of extending the ArrayList and implementing

Answer 1

I don't think this is a good practice. Consider instead writing a Util-Method in a Util-Class taking two parameters: The array list and the object you would like to add. There you can check whatever you want and can reuse the logic all over your code.