Apply "formulas" to doubles in an array list of ArrayList?

I have a table that I made by taking array list and storing it into another array list and it is composed of strings and doubles. Now I want to apply formulas to the 开发者_Python百科doubles in the Table and I am wondering how to do this. And is there any way for them to update if the numbers in the table change ?

org.apache.poi.ss.usermodel.FormulaEvaluator has an evaluate() method that may be useful in this context. There's an example here.