A simple project made little cards

This small project is: to distribute five three players take turns playing cards, playing cards and can be re-wash.
First, we want a new pair of existing cards, then we shuffle operations on the deck. Down to three players take turns distribution.

First playing cards have attributes:

• Color
• size

Let's create a Card class:

class Card {
    public String suit;//花色
    public String rank;//大小

    @Override
    public String toString() {
        return "[" + suit + " " + rank + "]";
    }
}

Due to the size of playing cards have "A, J, Q, K ", can not all be represented with int, so we use the String to represent.
Here we need to buy a new pair of playing cards, we use an ArrayList to create a Vice new cards:

	public static String[] SUITS = {"♥️", "♦️", "♣️", "♠️"};
    public static String[] RANKS = {"A", "2", "3", "4", "5", "6", "7", "8", "9", "10",
                                    "J", "Q", "K"};
    public static List<Card> buyCard() {
        List<Card> list = new ArrayList<>();
        for (int i = 0; i < 4; i++) {
            for (int j = 0; j < 13; j++) {
                String suit = SUITS[i];
                String rank = RANKS[j];
                Card card = new Card();
                card.suit = suit;
                card.rank = rank;
                list.add(card);
            }
        }
        return list
    }

We shuffle Collections class shuffle shuffling method.

        Collections.shuffle(list);

The next step is to distribute the cards:

	// List<List<Card>> 首先 List<Card> 这个是一个扑克牌的数组，
	//然后 List<List<Card>> 这个相当于是一个 '二维数组'，
	//这个数组里面的每个元素又是一个 List<Card>，
	//这样就模拟出了 3 个 List<Card> 扑克牌数组，相当于三个玩家
 	List<List<Card>> player = new ArrayList<>();
    player.add(new ArrayList<>());
    player.add(new ArrayList<>());
    player.add(new ArrayList<>());

    for (int i = 0; i < 5; i++) {
        for (int j = 0; j < 3; j++) {
            player.get(j).add(list.remove(0));
        }
    }

This project complete code:

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

class Card {
    public String suit;
    public String rank;

    @Override
    public String toString() {
        return "[" + suit + " " + rank + "]";
    }
}

public class CardDemo {

    public static String[] SUITS = {"♥️", "♦️", "♣️", "♠️"};
    public static String[] RANKS = {"A", "2", "3", "4", "5", "6", "7", "8", "9", "10",
                                    "J", "Q", "K"};
    public static List<Card> buyCard() {
        List<Card> list = new ArrayList<>();
        for (int i = 0; i < 4; i++) {
            for (int j = 0; j < 13; j++) {
                String suit = SUITS[i];
                String rank = RANKS[j];
                Card card = new Card();
                card.suit = suit;
                card.rank = rank;
                list.add(card);
            }
        }
        return list;
    }

    public static void main(String[] args) {
        List<Card> list = buyCard();
        System.out.println("刚买回来的牌:");
        System.out.println(list);
        Collections.shuffle(list);
        System.out.println("洗过之后的牌:");
        System.out.println(list);

        //三人轮流抽牌,每人一共抽5张
        List<List<Card>> player = new ArrayList<>();
        player.add(new ArrayList<>());
        player.add(new ArrayList<>());
        player.add(new ArrayList<>());

        for (int i = 0; i < 5; i++) {
            for (int j = 0; j < 3; j++) {
                player.get(j).add(list.remove(0));
            }
        }

        System.out.println("玩家1的手牌:");
        System.out.println(player.get(0));
        System.out.println("玩家2的手牌:");
        System.out.println(player.get(1));
        System.out.println("玩家3的手牌:");
        System.out.println(player.get(2));
        System.out.println("剩余的牌:");
        System.out.println(list);
    }
}

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