private static void mineClearance() {
  // 聲明一個二維數(shù)組表示掃雷地圖
  String[][] mineClearanceMap = new String[9][9];
  //初始化數(shù)組
  for (int i = 0; i < mineClearanceMap.length; i++) {
   for (int j = 0; j < mineClearanceMap.length; j++) {
    mineClearanceMap[i][j] = "0";
   }
  }
  Random random = new Random();
  //隨機生成地雷
  for (int i = 0; i < 25; i++) {
   mineClearanceMap[random.nextInt(mineClearanceMap.length)][random.nextInt(mineClearanceMap.length)] = "*";// *表示雷
  }

  //mineClearanceMap[i][j]的一周的坐標(biāo)，用i+x,j+y得到周圍的坐標(biāo)
  int x[] = { -1, -1, -1, 0, 0, 1, 1, 1 };
  int y[] = { -1, 0, 1, -1, 1, -1, 0, 1 };

  for (int i = 0; i < mineClearanceMap.length - 1; i++) {
   for (int j = 0; j < mineClearanceMap.length - 1; j++) {
    int count = 0;
    if (!"*".equals(mineClearanceMap[i][j])) {
     for (int k = 0; k < 8; k++) {
      int xx = i + x[k];
      int yy = j + y[k];
      if (xx >= 0 && yy >= 0) {// 坐標(biāo)不能出界，數(shù)組從（0，0）開始
       if (mineClearanceMap[xx][yy] == "*") {
        count = count + 1;// 累計這八個方位的雷總數(shù)
       }
      }
     }
     mineClearanceMap[i][j] = count + "";// 輸出每個位置周圍的雷數(shù)
    }

   }

  }

  System.out.println("得到的掃雷圖，*為雷");
  for (int j = 0; j < mineClearanceMap.length; j++) {
   for (int j2 = 0; j2 < mineClearanceMap.length; j2++) {
    System.out.print(mineClearanceMap[j][j2]);
   }
   System.out.println();
  }

 }