编写程序，实现简单的三子棋游戏。在三子棋中，双方在3×3的棋盘中轮流下棋，一方用*示，另一方用O表示。如果一方的3个棋子占据了同一行，同一列或者对角线，则该方获胜。如果棋盘已被棋子占满，但没有一方获胜则出现平局。在程序中，一方为用户，用户在界面上输入每次下棋的位置；另一方下棋的位置为随机自动生成。
import javax.swing.JOptionPane;
public class Main {
public static void main(String[] args) {
char []s=new char[9];
for(int i=0;i<9;i++) {
s[i]=(char)(i+49);
}
int i=0;
while(i++<5) {
String str=JOptionPane.showInputDialog("------------------\n"
+"| "+s[0]+" | "+s[1]+" | "+s[2]+" |\n"
+"| "+s[3]+" | "+s[4]+" | "+s[5]+" |\n"
+"| "+s[6]+" | "+s[7]+" | "+s[8]+" |\n"
+"------------------\n"
+ "请输入位置：");
while(str.length()==0||(str.charAt(0)-49)<0||(str.charAt(0)-49)>8) {
str=JOptionPane.showInputDialog("------------------\n"
+"| "+s[0]+" | "+s[1]+" | "+s[2]+" |\n"
+"| "+s[3]+" | "+s[4]+" | "+s[5]+" |\n"
+"| "+s[6]+" | "+s[7]+" | "+s[8]+" |\n"
+"------------------\n"
+ "输入错误，请重新输入：");
}
char index=str.charAt(0);
while(s[index-49]=='*'||s[index-49]=='o') {
str=JOptionPane.showInputDialog("------------------\n"
+"| "+s[0]+" | "+s[1]+" | "+s[2]+" |\n"
+"| "+s[3]+" | "+s[4]+" | "+s[5]+" |\n"
+"| "+s[6]+" | "+s[7]+" | "+s[8]+" |\n"
+"------------------\n"
+ "此位置已占用，请重新输入：");
index=str.charAt(0);
while(str.length()==0||(str.charAt(0)-49)<0||(str.charAt(0)-49)>8) {
str=JOptionPane.showInputDialog("------------------\n"
+"| "+s[0]+" | "+s[1]+" | "+s[2]+" |\n"
+"| "+s[3]+" | "+s[4]+" | "+s[5]+" |\n"
+"| "+s[6]+" | "+s[7]+" | "+s[8]+" |\n"
+"------------------\n"
+ "输入错误，请重新输入：");
}
}
s[index-49]='*';
if((s[0]=='*'&&s[3]=='*'&&s[6]=='*')||
(s[1]=='*'&&s[4]=='*'&&s[7]=='*')||
(s[2]=='*'&&s[5]=='*'&&s[8]=='*')||
(s[0]=='*'&&s[1]=='*'&&s[2]=='*')||
(s[3]=='*'&&s[4]=='*'&&s[5]=='*')||
(s[6]=='*'&&s[7]=='*'&&s[8]=='*')||
(s[0]=='*'&&s[4]=='*'&&s[8]=='*')||
(s[2]=='*'&&s[4]=='*'&&s[6]=='*'))
{
JOptionPane.showMessageDialog(null, "------------------\n"
+"| "+s[0]+" | "+s[1]+" | "+s[2]+" |\n"
+"| "+s[3]+" | "+s[4]+" | "+s[5]+" |\n"
+"| "+s[6]+" | "+s[7]+" | "+s[8]+" |\n"
+"------------------\n"
+ "恭喜你赢了");
break;
}
int b=(int)(Math.random()*9);
while(s[b]=='*'||s[b]=='o')
{
b=(int)(Math.random()*9);
}
s[b]='o';
if((s[0]=='o'&&s[3]=='o'&&s[6]=='o')||
(s[1]=='o'&&s[4]=='o'&&s[7]=='o')||
(s[2]=='o'&&s[5]=='o'&&s[8]=='o')||
(s[0]=='o'&&s[1]=='o'&&s[2]=='o')||
(s[3]=='o'&&s[4]=='o'&&s[5]=='o')||
(s[6]=='o'&&s[7]=='o'&&s[8]=='o')||
(s[0]=='o'&&s[4]=='o'&&s[8]=='o')||
(s[2]=='o'&&s[4]=='o'&&s[6]=='o'))
{
JOptionPane.showMessageDialog(null, "------------------\n"
+"| "+s[0]+" | "+s[1]+" | "+s[2]+" |\n"
+"| "+s[3]+" | "+s[4]+" | "+s[5]+" |\n"
+"| "+s[6]+" | "+s[7]+" | "+s[8]+" |\n"
+"------------------\n"
+ "失败了，再接再励");
break;
}
}
if(i==6) {
JOptionPane.showMessageDialog(null, "------------------\n"
+"| "+s[0]+" | "+s[1]+" | "+s[2]+" |\n"
+"| "+s[3]+" | "+s[4]+" | "+s[5]+" |\n"
+"| "+s[6]+" | "+s[7]+" | "+s[8]+" |\n"
+"------------------\n"
+ "平局，还差一点哦");
}
}
}
