（1）首先调用Chessboard 类型的chessboard 属性中的initBoard()与printBoard()方法去初始

化与打印棋盘。

 （2）从控制台获取用户的输入。

 （3）再调用本类的isValid()方法去验证玩家输入的合法性，如果输入不合法，返回第2 步继续，

否则到第4 步。

 （4）把玩家下的棋子位置赋值为 ● 。

 （5）调用isWon( int posX , int posY , String chessman )判断玩家是否赢了。如果玩家赢了，

则调用isReply()方法输出的信息询问玩家是否重新游戏，如果玩家输入y，则返回第1 步重新

开始。

 （6）调用computerDo()方法随机生成计算机的x,y 坐标，并把board[x][y] 赋值为 ○ 。如果

计算机赢了，则调用isReply()方法输出的信息询问玩家是否重新游戏，如果玩家输入y，则返

回第1 步重新开始，否则返回第2 步轮到用户输入。-(1) The first call Chessboard type chessboard properties initBoard () and printBoard () method to initialize and print the board. 　(2) to obtain user input　the console. 　(3) and then call this class isValid () method to verify the legitimacy of player input, if the input is not valid, return to step 2 to continue, otherwise to step 4. 　(4) under the pawn position players assigned to " ●" . 　(5) calls isWon (int posX, int posY, String chessman) to determine whether the player wins. If the player wins, then call isReply () method outputs information to re-ask the players if the game, if a player enter y, then return to step 1 and start again. 　(6) calling computerDo () method of a computer generated random x, y coordinates, and the board [x] [y] is assigned " ○" . If the computer wins, then call isReply () method outputs information to re-ask the players if the game, if a player enter y, then return to step 1 to start again, otherw