敏捷软件开发（上篇）

    public boolean isEmpty()
    {
        return size() == 0;
    }

    public int size()
    {
        return cards.size();
    }

    public void add(int card) throws IllegalStateException
    {
        if(CARDS_IN_DECK == size())
            throw new IllegalStateException("Cannot add more than 52 cards");

        cards.add(new Integer(card));
    }

    public int top()
    {
        return ((Integer) cards.get(0)).intValue();
    }

    public void remove()
    {
        cards.remove(0);
    }
}

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