listitem.java

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package example.fireworks;


class ListItem
{
    ListItem next = null;
    ListItem prev = null;


    protected ListItem()
    {
    }


    void remove()
    {
        if ((next == null) && (prev == null))
        {
            throw new IllegalArgumentException("remove item not in a list");
        }

        if (next != null)    // not last in list
        {
            next.prev = prev;
        }
        prev.next = next;

        next = null;
        prev = null;
    }
}