原题：In a game if TicTacToe,two players take turns marking an available cell in a 3x3 grid with their respective tokens(either X or O).When one player has placed three tokens in a horizontal,vertical or diagonal row on

the gird,the game is over and that player has won,A draw(no winner) occurs when all the cells on the gird have been filled with tokens and neither player has achiceved a win,Create a program for playing TicTacToe.The program prompts two players to enter X

token is enterd,the program redisplays the board on the console and deter=mines the of the game (win,draw,or continue)。

题目来源：

题目选自《JAVA程序语言设计》 P254-7.9***

代码如下：

import java.util.Scanner;

public class Main {

public static int[][] Chess=new int[3][3]; //建立九宫格

public static int player=1;//1 为X，-1为O

public static int count=0;//计数器，记录九宫格上的棋子数

public static void main(String[] args) {

Scanner input=new Scanner(System.in);

while(true) { //建立游戏循环

while(true) { //建立输入循环

System.out.print("Enter a row(0, 1 or 2) for player");

if(player == 1)

System.out.print(" X: ");

else

System.out.print(" O: ");

int row = input.nextInt(); //输入行row上的位置

System.out.print("Enter a column(0, 1 or 2) for player");

if(player == 1)

System.out.print(" X: ");

else

System.out.print(" O: ");

int column = input.nextInt(); //输入列column上的位置

if (Judgingrange(row, column, player) == true) { //判断输入是否在九宫格内且输入位置没有棋子，

break; //如果符合则跳出输入循环

}

}

ShowCheckerboard(); //显示当前九宫格局势

if (JudgingWin(player) == true) { //判断是否有人赢

if (player==1)

System.out.println("X player win");

else

System.out.println("O player win");

System.out.print("Would you like to continue? (Y or N):");

String choose = input.next();

if (choose.equals("Y"))

{

for (int i=0; i<3 ; i++)

for (int j=0; j<3 ; j++)

Chess[i][j]=0;

count=0;

player=1;

continue;

}//重新开始游戏

else if (choose.equals("N"))

{

break;

}//跳出游戏循环

}

if (count == 9) { //如果九宫格每个格上都有棋子

System.out.println("X and O draw"); //则是平局

System.out.print("Would you like to continue? (Y or N):");

String choose = input.next();

if (choose.equals("Y"))

{

for (int i=0; i<3 ; i++)

for (int j=0; j<3 ; j++)

Chess[i][j]=0;

count=0;

player=1;

continue;

}//重新开始游戏

else if (choose.equals("N"))

{

break;

}//跳出游戏循环

}

player=-player;

}

System.out.println("Game Over!");

}

public static boolean Judgingrange(int x,int y, int num)

{

if (x < 0 || x > 2 || y < 0 || y > 2 ) { //检查是否越界

System.out.println("Input out, please input again.");

return false;

}

if (Chess[x][y] == 0) { //如果当前位置没有棋子

Chess[x][y] = num;

count++;

return true;

}

else { //如果当前位置有棋子

System.out.println("There's already a piece, Input out, please input again.");

return false;

}

}

public static boolean JudgingWin(int num) //判断是否X和O是否有赢

{

for (int i = 0; i < 3; i++) { //检查行和列上是否有三个一样的棋子

if (Chess[0][i] == Chess[1][i] && Chess[1][i] == Chess[2][i] &&Chess[2][i] == num) //行

{

return true;

}

else if (Chess[i][0] == Chess[i][1] && Chess[i][1] == Chess[i][2] && Chess[i][2] == num) //列

{

return true;

}

}

//检查主对角线和副对角线上是否有三个一样的棋子

if (Chess[0][0] == Chess[1][1] && Chess[1][1] == Chess[2][2] && Chess[2][2] == num)//主对角线

return true;

else if (Chess[0][2] == Chess[1][1] && Chess[1][1] == Chess[2][0] && Chess[2][0] == num)//副对角线

return true;

return false;

}

public static void ShowCheckerboard()//输出九宫格局势

{

System.out.println("—————————————");

for (int i = 0; i < 3; ++i) {

System.out.print("|");

for (int j = 0; j < 3; ++j) {

if (Chess[i][j] == 1 )

System.out.print(" X |");

else if(Chess[i][j] == -1)

System.out.print(" O |");

else

System.out.print(" |");

}

System.out.println();

System.out.println("—————————————");

}

}

}

运行结果：

/*output:

case 1:

Enter a row(0, 1 or 2) for player X: 1

Enter a column(0, 1 or 2) for player X: 1

—————————————

| | | |

—————————————

| | X | |

—————————————

| | | |

—————————————

Enter a row(0, 1 or 2) for player O: 2

Enter a column(0, 1 or 2) for player O: 1

—————————————

| | | |

—————————————

| | X | |

—————————————

| | O | |

—————————————

Enter a row(0, 1 or 2) for player X: 2

Enter a column(0, 1 or 2) for player X: 2

—————————————

| | | |

—————————————

| | X | |

—————————————

| | O | X |

—————————————

Enter a row(0, 1 or 2) for player O: 0

Enter a column(0, 1 or 2) for player O: 0

—————————————

| O | | |

—————————————

| | X | |

—————————————

| | O | X |

—————————————

Enter a row(0, 1 or 2) for player X: 1

Enter a column(0, 1 or 2) for player X: 2

—————————————

| O | | |

—————————————

| | X | X |

—————————————

| | O | X |

—————————————

Enter a row(0, 1 or 2) for player O: 0

Enter a column(0, 1 or 2) for player O: 2

—————————————

| O | | O |

—————————————

| | X | X |

—————————————

| | O | X |

—————————————

Enter a row(0, 1 or 2) for player X: 1

Enter a column(0, 1 or 2) for player X: 0

—————————————

| O | | O |

—————————————

| X | X | X |

—————————————

| | O | X |

—————————————

X player win

Would you like to continue? (Y or N):N

Game Over!

case 2 :

Enter a row(0, 1 or 2) for player X: 2

Enter a column(0, 1 or 2) for player X: 3

Input out, please input again.

Enter a row(0, 1 or 2) for player X: 1

Enter a column(0, 1 or 2) for player X: 1

—————————————

| | | |

—————————————

| | X | |

—————————————

| | | |

—————————————

Enter a row(0, 1 or 2) for player O: 0

Enter a column(0, 1 or 2) for player O: 0

—————————————

| O | | |

—————————————

| | X | |

—————————————

| | | |

—————————————

Enter a row(0, 1 or 2) for player X: 2

Enter a column(0, 1 or 2) for player X: 1

—————————————

| O | | |

—————————————

| | X | |

—————————————

| | X | |

—————————————

Enter a row(0, 1 or 2) for player O: 0

Enter a column(0, 1 or 2) for player O: 1

—————————————

| O | O | |

—————————————

| | X | |

—————————————

| | X | |

—————————————

Enter a row(0, 1 or 2) for player X: 2

Enter a column(0, 1 or 2) for player X: 1

There's already a piece, Input out, please input again.

Enter a row(0, 1 or 2) for player X: 2

Enter a column(0, 1 or 2) for player X: 0

—————————————

| O | O | |

—————————————

| | X | |

—————————————

| X | X | |

—————————————

Enter a row(0, 1 or 2) for player O: 0

Enter a column(0, 1 or 2) for player O: 2

—————————————

| O | O | O |

—————————————

| | X | |

—————————————

| X | X | |

—————————————

O player win

Would you like to continue? (Y or N):N

Game Over!

case 3:

Enter a row(0, 1 or 2) for player X: 1

Enter a column(0, 1 or 2) for player X: 1

—————————————

| | | |

—————————————

| | X | |

—————————————

| | | |

—————————————

Enter a row(0, 1 or 2) for player O: 2

Enter a column(0, 1 or 2) for player O: 2

—————————————

| | | |

—————————————

| | X | |

—————————————

| | | O |

—————————————

Enter a row(0, 1 or 2) for player X: 1

Enter a column(0, 1 or 2) for player X: 0

—————————————

| | | |

—————————————

| X | X | |

—————————————

| | | O |

—————————————

Enter a row(0, 1 or 2) for player O: 1

Enter a column(0, 1 or 2) for player O: 2

—————————————

| | | |

—————————————

| X | X | O |

—————————————

| | | O |

—————————————

Enter a row(0, 1 or 2) for player X: 0

Enter a column(0, 1 or 2) for player X: 2

—————————————

| | | X |

—————————————

| X | X | O |

—————————————

| | | O |

—————————————

Enter a row(0, 1 or 2) for player O: 2

Enter a column(0, 1 or 2) for player O: 0

—————————————

| | | X |

—————————————

| X | X | O |

—————————————

| O | | O |

—————————————

Enter a row(0, 1 or 2) for player X: 2

Enter a column(0, 1 or 2) for player X: 1

—————————————

| | | X |

—————————————

| X | X | O |

—————————————

| O | X | O |

—————————————

Enter a row(0, 1 or 2) for player O: 0

Enter a column(0, 1 or 2) for player O: 1

—————————————

| | O | X |

—————————————

| X | X | O |

—————————————

| O | X | O |

—————————————

Enter a row(0, 1 or 2) for player X: 0

Enter a column(0, 1 or 2) for player X: 0

—————————————

| X | O | X |

—————————————

| X | X | O |

—————————————

| O | X | O |

—————————————

X and O draw

Would you like to continue? (Y or N):N

Game Over!

*///~