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Accessing objects from Collection

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public class Store implements hw9.interfaces.StoreInterface {
private Collection inventory = new ArrayList();
public hw9.interfaces.InventoryItemInterface getInventoryItem(String itemName) {
// inventory.indexOf(itemName);
InventoryItem name = new InventoryItem();
String gotName = name.getName();
I have a Collection that is created called inventory. I believe I've created an okay method to add to the collection. To test I need to fix my above method. Problem is Collection methods do not have a get function. I'd like to access the methods in ArrayList but don't know how. Please suggest how?
p.s. Here's my method to add input into a collection as an object;
public void addInventory(String name, String type, double cost, double
price) {
InventoryItem i = new InventoryItem(name, type, cost, price);

InventoryItem () is a constructor in InventoryItem class which has the setName() and getName() methods. This is just there to teach me how to think in terms of protecting code I think. To really put into and get out of the collection all I would need I believe is the Store class.
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Eclipse IDE VI Editor Java
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You would use an Iterator to loop through the Collection.
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