I want to modify an arraylist that is already shown on the board, but they ask me to discount items. what I want is to discount the quantity of the article from the row selected in the table. my arralist has this information
cont_compras {code, article, cost, QUANTITY, date};
that is my arraylist and I want to discount it through a textFiel typed by roof, that modifies the subtraction ... that QUANTITY = quantity_of_article - textFiel;