saolei.java是编写一个扫雷程序，可以选择难度，1.2.3.分别为3行3列，6行6列，9行9列的数列，可供玩家游戏-saolei.java demining is to write a program, you can choose the difficulty, 1.2.3., respectively 3 rows 3, 6 rows 6, 9 rows 9 columns of the game for players