How do I get back a vector? I tried:

import oz.*;
Iterator v = getVector();
//but it gives me error says:
Method getVector not found in this class.

Then i tried:
Iterator v = oz.getVector();
//the error is:
Undefined variable, class, or package name: oz



under directory oz/checkout.java, I have:

private Vector cart = new Vector();
public Memory(String id) {
   this.id = id;
   cart.addElement(id);
}

public Iterator getVector() {
   return cart.iterator();
}

The method <code>getVector()</code> has been defined as a member operation, that is, a method belonging to an instance, an object, instead of a class.
<p>
A member operation shall only be called referring to an instance, e.g. <code>myObj.getVector()</code>.
<p>
So, in order for the first code block to work, the <code>Iterator v = getVector()</code> must be located within one of the <code>checkout</code> classes member operations.

This is what you need to do :

Checkout checkoutObj = new Checkout();
Vector v = checkoutObj.getVector();

This is because getVector is a member method of the Checkout class .