Using objects in ArrayList

Question

I have simple class:

public class Item {

private double price;
private String name; 

public double getPrice() {return Price;}

}

and I have some diffrent objects of Item in the basket:

ArrayList basket = new ArrayList();
basket.add(newItem);

I would like to use something like that to get price:

basket.get(0).getPrice()
basket.get(1).getPrice()

Of course it doesn't work.

Answer 1

ArrayList basket = new ArrayList();

Two things wrong here:

• you are using raw types; you should use generics (<= click link for tutorial)
• the type of basket should not be the implementation type ArrayList, you should program against the interface List

It should look like this:

List<Item> basked = new ArrayList<>();

Answer 2

You can solve it in either of these two ways :

1. Make the list Item list

   ArrayList<Item> basket = new ArrayList<Item>();

or

2. Type cast the object before you use them

   ((Item)basket.get(0)).getPrice();

I would prefer the first option.

Answer 3

Generics.

List<Item> basket = new ArrayList<Item>();
basket.add(new Item());
basket.get(0).getPrice();