Inherit ArrayList from superclass

Question

I have an ArrayList in a class called QuantityCatalogue and i made another class that extends the first class.(public class Buy extends QuantityCatalogue).How can i inherit the ArrayList that i made in QuantityCatalogue and use it in Buy class? Is this right?

public class Buy extends QuantityCatalogue
{
    public Buy(ArrayList<String> items,ArrayList<Integer> quantity)
    {
        super(items,quantity);
    }
}

Thank you in advance

Answer 1

Declare a private ArrayList field in superclass, declare a public setter method in supeclass, and in your subclass call this setter method to set the field'value:

 public class QuantityCatalogue {
        private ArrayList<String> items;

            //this method helps us change the value of field items
        public void setItems(ArrayList<String> items) {
            this.items = items;
        }

          .....
    }

    public class Buy extends QuantityCatalogue {
        public void someMethod(ArrayList<String> items) {
            //call setItems method of superclass
            this.setItems(items);
        }
    }