前言

以下是学习Java顺序表的一个实例应用———简单的洗牌算法。

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目录

前言

定义每张扑克牌的属性

生成一副扑克牌（不包含大小王）

洗牌方法

发牌方法

发牌测试

结果

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简单的洗牌算法

定义每张扑克牌的属性

package Demo;public class Card {public int rank;//数字public String suit;//花色public Card(int rank,String suit){this.rank=rank;this.suit=suit;}@Overridepublic String toString() {return "{" + suit + " "+ rank + '}';}
}

生成一副扑克牌（不包含大小王）

package Demo;import java.util.ArrayList;
import java.util.List;
import java.util.Random;public class Cards {//4个花色  13张牌public static final String[] suits={"♥","♠","♣","♦"};//生成一副牌52张  4*13 不包含大小王public List<Card> buyCard(){List<Card> cardList=new ArrayList<>();for (int i = 0; i < 4; i++) {for (int j = 0; j < 13; j++) {int rank=j;String suit=suits[i];Card card=new Card(rank,suit);cardList.add(card);//生成一张牌}}return cardList;}
}

洗牌方法

    //洗牌public void shuffle(List<Card> cardList){Random random=new Random();//让i=51，生成一个0~i的随机数，与i交换。i--，重复此过程，洗牌for (int i = cardList.size()-1;i>0; i--) {int randIndex= random.nextInt(i);//生成0~i的随机数放入randIndexswap(cardList,i,randIndex);}}//写一个交换方法，交换i和j下标的牌private void swap(List<Card> cardList,int i,int j){Card tmp=cardList.get(i);cardList.set(i,cardList.get(j));cardList.set(j,tmp);}

发牌方法

//三个人， 每个人轮流抓5张牌public void drawCard(List<Card> cardList){List<Card> hand1=new ArrayList<>();List<Card> hand2=new ArrayList<>();List<Card> hand3=new ArrayList<>();List<List<Card>>hands=new ArrayList<>();hands.add(hand1);hands.add(hand2);hands.add(hand3);for (int i = 0; i < 5; i++) {//i代表5张牌for (int j = 0; j < 3; j++) {//j代表3个人Card card=cardList.remove(0);    //怎么抓牌？ 每次删除0下标的牌hands.get(j).add(card);//hands.get(0)=hand1,以此类推}}System.out.println("第1个人的牌："+hand1);System.out.println("第2个人的牌："+hand2);System.out.println("第3个人的牌："+hand3);}

发牌测试

package Demo;import java.util.List;public class TestCard {public static void main(String[] args) {Cards cards=new Cards();List<Card> cardList=cards.buyCard();System.out.println("生成一副扑克牌：");System.out.println(cardList);cards.shuffle(cardList);System.out.println("洗牌后：");System.out.println(cardList);System.out.println("抓牌：");cards.drawCard(cardList);System.out.println("剩下的牌：");System.out.println(cardList);}
}

结果

生成一副扑克牌：
[{♥ 0}, {♥ 1}, {♥ 2}, {♥ 3}, {♥ 4}, {♥ 5}, {♥ 6}, {♥ 7}, {♥ 8}, {♥ 9}, {♥ 10}, {♥ 11}, {♥ 12}, {♠ 0}, {♠ 1}, {♠ 2}, {♠ 3}, {♠ 4}, {♠ 5}, {♠ 6}, {♠ 7}, {♠ 8}, {♠ 9}, {♠ 10}, {♠ 11}, {♠ 12}, {♣ 0}, {♣ 1}, {♣ 2}, {♣ 3}, {♣ 4}, {♣ 5}, {♣ 6}, {♣ 7}, {♣ 8}, {♣ 9}, {♣ 10}, {♣ 11}, {♣ 12}, {♦ 0}, {♦ 1}, {♦ 2}, {♦ 3}, {♦ 4}, {♦ 5}, {♦ 6}, {♦ 7}, {♦ 8}, {♦ 9}, {♦ 10}, {♦ 11}, {♦ 12}]
洗牌后：
[{♦ 9}, {♠ 9}, {♥ 7}, {♥ 4}, {♠ 4}, {♥ 0}, {♥ 10}, {♣ 7}, {♠ 6}, {♥ 5}, {♣ 4}, {♥ 1}, {♠ 1}, {♥ 11}, {♦ 3}, {♦ 1}, {♥ 2}, {♣ 10}, {♣ 1}, {♣ 0}, {♣ 2}, {♥ 12}, {♦ 4}, {♥ 8}, {♣ 9}, {♠ 11}, {♠ 12}, {♣ 5}, {♦ 12}, {♠ 0}, {♠ 7}, {♦ 8}, {♦ 11}, {♦ 2}, {♠ 5}, {♥ 3}, {♣ 12}, {♥ 9}, {♣ 3}, {♦ 5}, {♦ 0}, {♠ 8}, {♦ 10}, {♠ 2}, {♦ 7}, {♠ 10}, {♠ 3}, {♥ 6}, {♦ 6}, {♣ 8}, {♣ 11}, {♣ 6}]
抓牌：
第1个人的牌：[{♦ 9}, {♥ 4}, {♥ 10}, {♥ 5}, {♠ 1}]
第2个人的牌：[{♠ 9}, {♠ 4}, {♣ 7}, {♣ 4}, {♥ 11}]
第3个人的牌：[{♥ 7}, {♥ 0}, {♠ 6}, {♥ 1}, {♦ 3}]
剩下的牌：
[{♦ 1}, {♥ 2}, {♣ 10}, {♣ 1}, {♣ 0}, {♣ 2}, {♥ 12}, {♦ 4}, {♥ 8}, {♣ 9}, {♠ 11}, {♠ 12}, {♣ 5}, {♦ 12}, {♠ 0}, {♠ 7}, {♦ 8}, {♦ 11}, {♦ 2}, {♠ 5}, {♥ 3}, {♣ 12}, {♥ 9}, {♣ 3}, {♦ 5}, {♦ 0}, {♠ 8}, {♦ 10}, {♠ 2}, {♦ 7}, {♠ 10}, {♠ 3}, {♥ 6}, {♦ 6}, {♣ 8}, {♣ 11}, {♣ 6}]