shoppingcart.java

《Java与模式》一书的源代码

package com.javapatterns.iterator.copsandsales;

import java.util.Vector;

public abstract class ShoppingCart
{
    public abstract Iterator createIterator();

    public void append(Object anObj)
    {
        elements.addElement(anObj);
    }

    public void remove(Object anObj)
    {
        elements.removeElement(anObj);
    }

    public Object currentItem(int n)
    {
        return elements.elementAt(n);
    }

    public int count()
    {
        return elements.size();
    }

    private Vector elements = new Vector(5);
}