设计一个麻将游戏 java 代码

这是一个较为复杂的项目，需要考虑到游戏规则、图形界面、玩家互动等多方面。以下是一个简单的麻将游戏Java代码示例：

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

public class MahjongGame {
    private List<String> tiles; // 所有麻将牌
    private List<String> player1; // 玩家1的手牌
    private List<String> player2; // 玩家2的手牌
    private List<String> player3; // 玩家3的手牌
    private List<String> player4; // 玩家4的手牌
    private int round; // 第几局

    public MahjongGame() {
        initTiles();
        dealTiles();
    }

    // 初始化麻将牌
    private void initTiles() {
        tiles = new ArrayList<>();
        // 添加万、条、筒
        for (int i = 0; i < 3; i++) {
            for (int j = 1; j <= 9; j++) {
                for (int k = 0; k < 4; k++) {
                    tiles.add((i + 1) + "" + (j) + "");
                }
            }
        }
        // 添加东、南、西、北、中、发、白
        for (int i = 1; i <= 7; i++) {
            for (int j = 0; j < 4; j++) {
                tiles.add((i + 3) + "");
            }
        }
        // 打乱麻将牌
        Collections.shuffle(tiles);
    }

    // 发牌
    private void dealTiles() {
        player1 = new ArrayList<>();
        player2 = new ArrayList<>();
        player3 = new ArrayList<>();
        player4 = new ArrayList<>();
        for (int i = 0; i < 13; i++) {
            player1.add(tiles.remove(0));
            player2.add(tiles.remove(0));
            player3.add(tiles.remove(0));
            player4.add(tiles.remove(0));
        }
    }

    // 开始游戏
    public void start() {
        round = 1;
        while (round <= 4) {
            System.out.println("第" + round + "局开始！");
            playRound();
            round++;
        }
        System.out.println("游戏结束！");
    }

    // 进行一局游戏
    private void playRound() {
        int dealer = (round - 1) % 4 + 1; // 庄家
        int winner = -1; // 胜者
        int drawCount = 0; // 和牌次数
        boolean end = false; // 结束标志
        List<String> tilesInWall = new ArrayList<>(tiles); // 剩余麻将牌
        List<String> discardPile = new ArrayList<>(); // 打出的牌

        System.out.println("庄家是玩家" + dealer + "。");

        // 玩家1开始摸牌
        int currentPlayer = dealer % 4 + 1; // 当前玩家
        while (!end) {
            String tile = tilesInWall.remove(0); // 摸牌
            switch (currentPlayer) {
                case 1:
                    player1.add(tile);
                    System.out.println("玩家1摸了一张牌：" + tile);
                    break;
                case 2:
                    player2.add(tile);
                    System.out.println("玩家2摸了一张牌：" + tile);
                    break;
                case 3:
                    player3.add(tile);
                    System.out.println("玩家3摸了一张牌：" + tile);
                    break;
                case 4:
                    player4.add(tile);
                    System.out.println("玩家4摸了一张牌：" + tile);
                    break;
            }
            // 判断是否和牌或者打牌
            if (isWin(currentPlayer, tile)) {
                winner = currentPlayer;
                System.out.println("玩家" + winner + "和牌！");
                end = true;
            } else {
                String discard = discard(currentPlayer); // 打牌
                discardPile.add(discard);
                System.out.println("玩家" + currentPlayer + "打出了一张牌：" + discard);
                currentPlayer = currentPlayer % 4 + 1;
                // 判断是否流局
                if (tilesInWall.size() == 0) {
                    drawCount++;
                    if (drawCount >= 4) {
                        end = true;
                    }
                }
            }
        }
        // 结算分数
        if (winner != -1) {
            System.out.println("本局胜者是玩家" + winner + "。");
        } else {
            System.out.println("本局流局。");
        }
    }

    // 判断是否和牌
    private boolean isWin(int player, String tile) {
        List<String> tiles = new ArrayList<>();
        switch (player) {
            case 1:
                tiles.addAll(player1);
                break;
            case 2:
                tiles.addAll(player2);
                break;
            case 3:
                tiles.addAll(player3);
                break;
            case 4:
                tiles.addAll(player4);
                break;
        }
        tiles.add(tile);
        // TODO: 判断是否和牌
        return false;
    }

    // 打牌
    private String discard(int player) {
        List<String> tiles = new ArrayList<>();
        switch (player) {
            case 1:
                tiles.addAll(player1);
                break;
            case 2:
                tiles.addAll(player2);
                break;
            case 3:
                tiles.addAll(player3);
                break;
            case 4:
                tiles.addAll(player4);
                break;
        }
        Scanner scanner = new Scanner(System.in);
        System.out.println("请玩家" + player + "选择要打出的一张牌：");
        // 打印玩家的手牌
        for (int i = 0; i < tiles.size(); i++) {
            System.out.print((i + 1) + ":" + tiles.get(i) + "\t");
        }
        System.out.println();
        int index = scanner.nextInt() - 1;
        while (index < 0 || index >= tiles.size()) {
            System.out.println("输入有误，请重新输入：");
            index = scanner.nextInt() - 1;
        }
        String discard = tiles.remove(index); // 打出选中的牌
        switch (player) {
            case 1:
                player1 = tiles;
                break;
            case 2:
                player2 = tiles;
                break;
            case 3:
                player3 = tiles;
                break;
            case 4:
                player4 = tiles;
                break;
        }
        return discard;
    }
}

这只是一个简单的麻将游戏Java代码示例，实际上还需要考虑很多其他因素，比如：玩家之间的交互、图形界面的设计等。