forwarditerator.java

《Java与模式》一书的源代码

package com.javapatterns.iterator.copsandsales;

public class ForwardIterator implements Iterator
{

    public ForwardIterator(ShoppingCart anObj)
    {
        obj = anObj;
    }

    public void first()
    {
        state = 0;
    }

    public void next()
    {
        if (!isDone())
        {
            state++;
        }
    }

    public boolean isDone()
    {
        if (state > obj.count() - 1)
        {
            return true;
        }
        return false;
    }

    public Object currentItem()
    {
        return obj.currentItem(state);
    }

    private int state;
    private ShoppingCart obj;
}