public Deck(int length)
	{
		Card[] cards=Card.values();
		this.cards=new PlayingCard[cards.length*length];
		for(int i=0;i<length; i++)
		{
			for(int j=0;j<cards.length;j++)
			{
				this.cards[j+i*cards.length]=new PlayingCard(cards[j]);
			}
		}
		this.shuffle();
	}