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Graph
for (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