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目录

🌤️简单的洗牌算法的代码实现

📑运行结果

public class Card {
public int rank; // 牌面值
public String suit; // 花色
@Override
public String toString() {
return String.format("[%s %d]", suit, rank);
}
}
import java.util.List;
import java.util.ArrayList;
import java.util.Random;
public class CardDemo {
public static final String[] SUITS = {"♠", "♥", "♣", "♦"};
// 买一副牌
private static List<Card> buyDeck() {
List<Card> deck = new ArrayList<>(52);
for (int i = 0; i < 4; i++) {
for (int j = 1; j <= 13; j++) {
String suit = SUITS[i];
int rank = j;
Card card = new Card();
card.rank = rank;
card.suit = suit;
deck.add(card);
}
}
return deck;
}
private static void swap(List<Card> deck, int i, int j) {
Card t = deck.get(i);
deck.set(i, deck.get(j));
deck.set(j, t);
}
private static void shuffle(List<Card> deck) {
Random random = new Random(20190905);
for (int i = deck.size() - 1; i > 0; i--) {
int r = random.nextInt(i);
swap(deck, i, r);
}
}
public static void main(String[] args) {
List<Card> deck = buyDeck();
System.out.println("刚买回来的牌:");
System.out.println(deck);
shuffle(deck);
System.out.println("洗过的牌:");
System.out.println(deck);
// 三个人，每个人轮流抓 5 张牌
List<List<Card>> hands = new ArrayList<>();
hands.add(new ArrayList<>());
hands.add(new ArrayList<>());
hands.add(new ArrayList<>());
for (int i = 0; i < 5; i++) {
for (int j = 0; j < 3; j++) {
hands.get(j).add(deck.remove(0));
}
}
System.out.println("剩余的牌:");
System.out.println(deck);
System.out.println("A 手中的牌:");
System.out.println(hands.get(0));
System.out.println("B 手中的牌:");