BlackJackHand.java

package Q7_01_Deck_of_Cards;

import java.util.ArrayList;

public class BlackJackHand extends Hand<BlackJackCard> {
	public BlackJackHand() {
		
	}
	
	public int score() {
		ArrayList<Integer> scores = possibleScores();
		int maxUnder = Integer.MIN_VALUE;
		int minOver = Integer.MAX_VALUE;
		for (int score : scores) {
			if (score > 21 && score < minOver) {
				minOver = score;
			} else if (score <= 21 && score > maxUnder) {
				maxUnder = score;
			}
		}
		return maxUnder == Integer.MIN_VALUE ? minOver : maxUnder;
	}
	
	private ArrayList<Integer> possibleScores() {
		ArrayList<Integer> scores = new ArrayList<Integer>();
		if (cards.size() == 0) {
			return scores;
		}
		for (BlackJackCard card : cards) {
			addCardToScoreList(card, scores);
		}
		return scores;
	}
	
	private void addCardToScoreList(BlackJackCard card, ArrayList<Integer> scores) {
		if (scores.size() == 0) {
			scores.add(0);
		} 
		int length = scores.size();
		for (int i = 0; i < length; i++) {
			int score = scores.get(i);
			scores.set(i, score + card.minValue());
			if (card.minValue() != card.maxValue()) {
				scores.add(score + card.maxValue());
			}
		}
	}
	
	public boolean busted() {
		return score() > 21;
	}
	
	public boolean is21() {
		return score() == 21;
	}
	
	public boolean isBlackJack() {
		if (cards.size() != 2) {
			return false;
		}
		BlackJackCard first = cards.get(0);
		BlackJackCard second = cards.get(1);
		return (first.isAce() && second.isFaceCard()) || (second.isAce() && first.isFaceCard());
	}
}