How to implement a simple three-piece game using Java?

Use of JOptionPane class

Write a program to implement a simple three-piece game. In three-piece chess, both sides take turns playing chess on a 3×3 chessboard. One side is represented by * and the other side is represented by O. If a side's 3 pieces occupy the same row, column or diagonal, that side wins. A draw occurs if the board is filled with pieces but no player wins. In the program, one party is the user, and the user inputs the position of each chess play on the interface; the position of the other party's chess play is randomly and automatically generated. The sample interface is shown in the figure.

Tips: (1) Use the methods provided in the Scanner class or JOptionPane class for input, and the output uses the methods in System.out or Methods provided by the JOptionPane class. (2) String processing can use the String or StringBuffer class.

Implementation code:

import java.util.Random;
import javax.swing.*;
public class Main {
   public static boolean check(StringBuffer st,int pos){   //检查pos上的棋子有没有获胜
      char des=st.charAt(pos);
      char []s=new char[10];
      for(int i=1;i<=9;i++) s[i]=st.charAt(i);
      if((s[3]==des&&s[6]==des&&s[9]==des)||
      (s[1]==des&&s[4]==des&&s[7]==des)||
      (s[2]==des&&s[5]==des&&s[8]==des)||
      (s[1]==des&&s[3]==des&&s[2]==des)||
      (s[6]==des&&s[4]==des&&s[5]==des)||
      (s[9]==des&&s[7]==des&&s[8]==des)||
      (s[1]==des&&s[5]==des&&s[9]==des)||
      (s[3]==des&&s[5]==des&&s[7]==des)) return true;
      return false;
   }
   public static void main(String[] args) {
      StringBuffer s= new StringBuffer("0123456789");
      String tp;
      for(int i=0;i<=5;){
         int k=-1;
         tp=JOptionPane.showInputDialog("---------------------------\n|    "+s.charAt(1)+"    |    "+s.charAt(2)+"    |    "+s.charAt(3)+"    |\n---------------------------\n|    "+s.charAt(4)+"    |    "+s.charAt(5)+"    |    "+s.charAt(6)+"    |\n---------------------------\n|    "+s.charAt(7)+"    |    "+s.charAt(8)+"    |    "+s.charAt(9)+"    |\n---------------------------\n"+"请输入落子位置(1~9)：");
         boolean f=true;
         if(tp.length()==1){
            k=tp.charAt(0)-&#39;0&#39;;
            if(k>=1&&k<=9){
               if(s.charAt(k)>=&#39;1&#39;&&s.charAt(k)<=&#39;9&#39;){
                  i++;        //有效下棋
                  f=false;
               }
            }
         }
         while(f){
            tp=JOptionPane.showInputDialog("---------------------------\n|    "+s.charAt(1)+"    |    "+s.charAt(2)+"    |    "+s.charAt(3)+"    |\n---------------------------\n|    "+s.charAt(4)+"    |    "+s.charAt(5)+"    |    "+s.charAt(6)+"    |\n---------------------------\n|    "+s.charAt(7)+"    |    "+s.charAt(8)+"    |    "+s.charAt(9)+"    |\n---------------------------\n"+"输入错误，请重新输入落子的位置：");
            if(tp.length()==1){
               k=tp.charAt(0)-&#39;0&#39;;
               if(k>=1&&k<=9){
                  if(s.charAt(k)>=&#39;1&#39;&&s.charAt(k)<=&#39;9&#39;){
                     i++;        //有效下棋
                     f=false;
                  }
               }
            }
         }
         //在k处落子
         s.replace(k,k+1,"O");
         if(check(s,k)){
            //获胜
            JOptionPane.showMessageDialog(null,"---------------------------\n|    "+s.charAt(1)+"    |    "+s.charAt(2)+"    |    "+s.charAt(3)+"    |\n---------------------------\n|    "+s.charAt(4)+"    |    "+s.charAt(5)+"    |    "+s.charAt(6)+"    |\n---------------------------\n|    "+s.charAt(7)+"    |    "+s.charAt(8)+"    |    "+s.charAt(9)+"    |\n---------------------------\n"+"恭喜你，你赢了！");
            break;
         }
         //电脑随机落子
         if(i==5) {
            JOptionPane.showMessageDialog(null,"---------------------------\n|    "+s.charAt(1)+"    |    "+s.charAt(2)+"    |    "+s.charAt(3)+"    |\n---------------------------\n|    "+s.charAt(4)+"    |    "+s.charAt(5)+"    |    "+s.charAt(6)+"    |\n---------------------------\n|    "+s.charAt(7)+"    |    "+s.charAt(8)+"    |    "+s.charAt(9)+"    |\n---------------------------\n"+"平局！");
            break;
         }
         Random rs=new Random();
         k=rs.nextInt(9)+1;
         while(k<1||k>9||s.charAt(k)==&#39;*&#39;||s.charAt(k)==&#39;O&#39;) k=rs.nextInt(9)+1;
         s.replace(k,k+1,"*");
         if(check(s,k)){
            //电脑胜
            JOptionPane.showMessageDialog(null,"---------------------------\n|    "+s.charAt(1)+"    |    "+s.charAt(2)+"    |    "+s.charAt(3)+"    |\n---------------------------\n|    "+s.charAt(4)+"    |    "+s.charAt(5)+"    |    "+s.charAt(6)+"    |\n---------------------------\n|    "+s.charAt(7)+"    |    "+s.charAt(8)+"    |    "+s.charAt(9)+"    |\n---------------------------\n"+"你输了，再接再厉吧！");
            break;
         }
      }
   }
}

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