思路框架同8.20 ：

C++:

#include<iostream>
#include<string>
using namespace std;
class Chess {
public:Chess();                         //初始化成员数据void show();                     //显示棋盘int input(int x,int y,int key);  //下棋int judge(int x,int y);          //判断结果string C[2] = { "X","O" };
private:string Graph[3][3];int  R = 9;                      //棋盘剩余空格
};
Chess::Chess(){for (int i = 0; i < 3; i++) {     //初始化Graphfor (int j = 0; j < 3; j++) {Graph[i][j] = " ";  }}
}
void Chess::show(){for (int i = 0; i<3 ; i++) {cout << "-------------" << endl;cout << "|";for (int j = 0; j < 3; j++) cout <<" "<< Graph[i][j] << " |";cout << endl;}cout << "-------------" << endl;
}
int Chess::input(int x,int y,int key) {if (y > 3 || y < 0){           //越界检测cout << "y is out of range[0,6]" << endl;return 1;}if (x > 3 || x < 0) {cout << "x is out of range" << endl;return 1;}if (Graph[x][y] != " ") {      //不能在同一格下棋cout << "(" << x << "," << y << "): has  exist" << endl;return 1;}Graph[x][y] = C[key % 2];    //赋值R--;                         //剩余格子减一return 0;
}
int Chess::judge(int x,int y) {int kx[8] = { 0, 1, 1, 1 },      //八个方向(4个正方向，另外4个负方向取反)ky[8] = { 1, 1, 0,-1 };int a, b, count = 0;for (int i = 0; i < 4; i++) {          //八个方向检测a = x;          //数据初始化b = y;count = 0;for (int j = 0; j < 2; j++) {      //检测四个正方向a += kx[i];b += ky[i];if (b > 2 || a > 2 || a < 0 || b < 0 || Graph[a][b] == " ")        //边界检测break;if (Graph[a][b] == Graph[x][y] )count++;}a = x;b = y;for (int j = 0; j < 2; j++) {      //检测四个负方向a -= kx[i];b -= ky[i];if (b > 2 || a > 2 || a < 0 || b < 0 || Graph[a][b] == " ")        //边界检测break;if (Graph[a][b] == Graph[x][y])count++;}if (count == 2)                 //四子相连，此人胜出return 1;}if(R==0)return -1;return 0;
}
int main() {Chess myChess;myChess.show();int x,y,key;for (int i = 0;;) {         //i奇偶决定颜色cout << "Enter a row (0, 1 or 2) for player "<< myChess.C[i % 2] <<": ";cin >> x;cout << "Enter a column (0, 1 or 2) for player " << myChess.C[i % 2] << ": ";cin >> y;if (myChess.input(x, y, i))    //bug检测continue;system("cls");          //清屏myChess.show();key = myChess.judge(x, y);   //key判断输赢，平局if (key==1) {cout << myChess.C[i % 2] << " player won" << endl;break;}else if (key == -1) {cout << "Chess draw" << endl;break;}i++;}
return 0;
}

Java：

请自己写