敏捷软件开发（上篇）

public class Card
{
    private final int value;

    public Card( int value )
    {
        if( value < 2 || value > 11 )
            throw new IllegalArgumentException( "Not a valid card value " + value );

        this.value = value;
    }

    public int getValue()
    {
        return value;
    }
}

public class Deck
{
    private static final int[] NUMBER_IN_DECK = new int[] {0, 0, 4, 4, 4, 4, 4, 4, 4,
                                                           4, 16, 4};
    …

    public void add( Card card ) throws IllegalStateException
    {

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