øving3

src/main/java/oving3/card/CardDeck.java

@@ -0,0 +1,43 @@
+package oving3.card;
+
+import java.util.ArrayList;
+
+public class CardDeck {
+	private ArrayList<Card> deck = new ArrayList<>();
+
+	CardDeck(int n) {
+		if (n < 0 || n > 13) {
+			throw new IllegalArgumentException("value of n needs to be >= 1 and <= 13");
+		}
+		char[] suits = { 'S', 'H', 'D', 'C' };
+		for (char suit : suits) {
+			for (int face = 1; face <= n; face++) {
+				deck.add(new Card(suit, face));
+			}
+		}
+	}
+
+	int getCardCount() {
+		return deck.size();
+	}
+
+	Card getCard(int n) {
+		return new Card('S', 1);
+	}
+
+	void shufflePerfectly() {
+		int n = deck.size();
+		if (n < 2) {
+			return;
+		}
+		ArrayList<Card> shuffledDeck = new ArrayList<>();
+		for (int i = 0; i < n / 2; i++) {
+			shuffledDeck.add(deck.get(i));
+			shuffledDeck.add(deck.get(n / 2 + i));
+		}
+		if (n % 2 != 0) {
+			shuffledDeck.add(deck.get(n - 1));
+		}
+		deck = shuffledDeck;
+	}
+}