写一个JAVA扫雷小游戏

好的，以下是一个简单的JAVA扫雷小游戏的实现，代码中有注释说明每个部分的作用。

import java.util.Random;
import java.util.Scanner;

public class Minesweeper {

    // 游戏难度，决定雷区大小和雷的数量
    private static final int EASY = 1;
    private static final int MEDIUM = 2;
    private static final int HARD = 3;

    // 游戏状态
    private static final int PLAYING = 0;
    private static final int WIN = 1;
    private static final int LOSE = -1;

    // 雷区
    private int[][] board;
    // 雷的数量
    private int numMines;
    // 游戏状态
    private int gameStatus;

    public Minesweeper(int difficulty) {
        // 根据难度获取雷区大小和雷的数量
        int size = 0;
        switch (difficulty) {
            case EASY:
                size = 8;
                numMines = 10;
                break;
            case MEDIUM:
                size = 12;
                numMines = 20;
                break;
            case HARD:
                size = 16;
                numMines = 40;
                break;
            default:
                System.out.println("Invalid difficulty level.");
                return;
        }

        // 初始化雷区
        board = new int[size][size];
        Random rand = new Random();
        for (int i = 0; i < numMines; i++) {
            int x = rand.nextInt(size);
            int y = rand.nextInt(size);
            // 如果该位置已经有雷了，重新生成一个位置
            while (board[x][y] == -1) {
                x = rand.nextInt(size);
                y = rand.nextInt(size);
            }
            board[x][y] = -1;
        }

        // 计算每个格子周围的雷的数量
        for (int i = 0; i < size; i++) {
            for (int j = 0; j < size; j++) {
                if (board[i][j] == -1)
                    continue;
                int count = 0;
                if (i > 0 && j > 0 && board[i - 1][j - 1] == -1)
                    count++;
                if (i > 0 && board[i - 1][j] == -1)
                    count++;
                if (i > 0 && j < size - 1 && board[i - 1][j + 1] == -1)
                    count++;
                if (j > 0 && board[i][j - 1] == -1)
                    count++;
                if (j < size - 1 && board[i][j + 1] == -1)
                    count++;
                if (i < size - 1 && j > 0 && board[i + 1][j - 1] == -1)
                    count++;
                if (i < size - 1 && board[i + 1][j] == -1)
                    count++;
                if (i < size - 1 && j < size - 1 && board[i + 1][j + 1] == -1)
                    count++;
                board[i][j] = count;
            }
        }

        // 初始化游戏状态
        gameStatus = PLAYING;
    }

    public void play() {
        Scanner scanner = new Scanner(System.in);
        while (gameStatus == PLAYING) {
            printBoard();
            System.out.print("Enter row and column (e.g. 1 2): ");
            int row = scanner.nextInt() - 1;
            int col = scanner.nextInt() - 1;
            // 判断输入是否合法
            if (row < 0 || row >= board.length || col < 0 || col >= board.length) {
                System.out.println("Invalid input.");
                continue;
            }
            // 如果已经翻开了该格子，提示用户重新输入
            if (board[row][col] >= 0 && board[row][col] <= 8) {
                System.out.println("This cell has already been revealed.");
                continue;
            }
            // 如果是雷，游戏结束，打印出所有的雷
            if (board[row][col] == -1) {
                gameStatus = LOSE;
                printBoard(true);
                System.out.println("You lose!");
                break;
            }
            // 如果是空格，翻开所有相邻的空格
            if (board[row][col] == 0) {
                reveal(row, col);
            }
            // 如果是数字格，直接翻开
            if (board[row][col] > 0 && board[row][col] <= 8) {
                board[row][col] += 10;
            }
            // 判断是否胜利
            if (isWin()) {
                gameStatus = WIN;
                printBoard(true);
                System.out.println("You win!");
                break;
            }
        }
    }

    // 打印出当前的雷区
    private void printBoard() {
        System.out.print("  ");
        for (int i = 1; i <= board.length; i++) {
            System.out.print(i + " ");
        }
        System.out.println();
        for (int i = 0; i < board.length; i++) {
            System.out.print((i + 1) + " ");
            for (int j = 0; j < board.length; j++) {
                if (board[i][j] == -1) {
                    System.out.print("* ");
                } else if (board[i][j] >= 0 && board[i][j] <= 8) {
                    System.out.print(". ");
                } else if (board[i][j] >= 10 && board[i][j] <= 18) {
                    System.out.print((board[i][j] - 10) + " ");
                }
            }
            System.out.println();
        }
    }

    // 打印出所有的雷
    private void printBoard(boolean showMines) {
        System.out.print("  ");
        for (int i = 1; i <= board.length; i++) {
            System.out.print(i + " ");
        }
        System.out.println();
        for (int i = 0; i < board.length; i++) {
            System.out.print((i + 1) + " ");
            for (int j = 0; j < board.length; j++) {
                if (board[i][j] == -1) {
                    if (showMines) {
                        System.out.print("* ");
                    } else {
                        System.out.print(". ");
                    }
                } else if (board[i][j] >= 0 && board[i][j] <= 8) {
                    System.out.print(". ");
                } else if (board[i][j] >= 10 && board[i][j] <= 18) {
                    System.out.print((board[i][j] - 10) + " ");
                }
            }
            System.out.println();
        }
    }

    // 翻开所有相邻的空格
    private void reveal(int row, int col) {
        if (row < 0 || row >= board.length || col < 0 || col >= board.length) {
            return;
        }
        if (board[row][col] >= 10) {
            return;
        }
        if (board[row][col] > 0 && board[row][col] <= 8) {
            board[row][col] += 10;
            return;
        }
        board[row][col] += 10;
        reveal(row - 1, col - 1);
        reveal(row - 1, col);
        reveal(row - 1, col + 1);
        reveal(row, col - 1);
        reveal(row, col + 1);
        reveal(row + 1, col - 1);
        reveal(row + 1, col);
        reveal(row + 1, col + 1);
    }

    // 判断是否胜利
    private boolean isWin() {
        for (int i = 0; i < board.length; i++) {
            for (int j = 0; j < board.length; j++) {
                if (board[i][j] == -1) {
                    continue;
                }
                if (board[i][j] >= 0 && board[i][j] <= 8) {
                    return false;
                }
            }
        }
        return true;
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("Welcome to Minesweeper!");
        System.out.println("Please select difficulty level:");
        System.out.println("1) Easy");
        System.out.println("2) Medium");
        System.out.println("3) Hard");
        int difficulty = scanner.nextInt();
        Minesweeper game = new Minesweeper(difficulty);
        game.play();
    }
}

该游戏支持三种不同的难度级别，分别是容易、中等和困难。玩家需要根据提示输入行和列的坐标，翻开雷区中的格子，直到所有的非雷格子都被翻开为止。如果翻开的格子是空格，那么所有相邻的空格也会被翻开。如果翻开的格子是数字格，那么只有这个格子会被翻开。如果翻开的格子是雷，那么游戏结束，打印出所有的雷。如果所有的非雷格子都被翻开，那么游戏胜利。