import java.util.ArrayList;

/**

* A pile of playing cards (of variable size).

*/

public class Pile {

private ArrayList<Card> cards;

/**

* Constructs an empty pile of cards.

*/

public Pile() {

this.cards = new ArrayList<Card>();

}

/**

* Adds a card to the bottom of the pile.

*/

public void addCard(Card card) {

this.cards.add(card);

}

/**

* Copies an entire deck into the pile.

*/

public void addDeck(Deck deck) {

for (Card card : deck.getCards()) {

this.cards.add(card);

}

}

/**

* Returns true if this pile has no cards.

*/

public boolean isEmpty() {

return this.cards.isEmpty();

}

/**

* Removes a card from the top of the pile.

*/

public Card popCard() {

return this.cards.remove(0);

}

}