解题思路

import java.util.Scanner;

public class Main{
    
    public static void main(String[] args){
        
        Scanner sin = new Scanner(System.in);
        String[] c = new String[9];
        int ic = 0;
        while(sin.hasNext()){
            c[ic++] = sin.next();
        }
        
        // 把一维数组变成二维数组 
        String[][] cc = new String[3][3];
        int con = 0;
        for(int n = 0;n<3;n++){
            for(int m=0;m<3;m++){
                cc[n][m] = c[con++];
            }
        }
        
        // 玩 “井”字棋
        String s = print1(cc);
        String s2 = print2(cc);
        String s3 = print3(cc);
       if(s.equals("K") || s2.equals("K") || s3.equals("K")){
           System.out.println("KiKi wins!");
       }else if(s.equals("B") || s2.equals("B") || s3.equals("B")){
        System.out.println("BoBo wins!");
       }else {
           System.out.println("No winner!");
       }
       
    }
    
    public static String print1(String[][] list){
        String s = "";
        for(int n = 0;n<3;n++){
            for(int m=0;m<3;m++){
                s += list[n][m];
            }
            if(s.equals("KKK")){
                return "K";
            }else if(s.equals("BBB")){
                return "B";
            }
           //清空字符串
            s = "";
        }
        return "O";
    }
    
        public static String print2(String[][] list){
        String s = "";
            int i = 0;
        for(int n = 0;n<3;n++){
            for(int m=0;m<3;m++){
                s += list[m][i];
            }
            i++;
            if(s.equals("KKK")){
                return "K";
            }else if(s.equals("BBB")){
                return "B";
            }
           //清空字符串
            s = "";
        }
        return "O";
    }
    
      public static String print3(String[][] list){
        String s = "";
        for(int n = 0;n<1;n++){
            for(int m=0;m<3;m++){
                s += list[m][m];
                
            }
            if(s.equals("KKK")){
                return "K";
            }else if(s.equals("BBB")){
                return "B";
            }
           //清空字符串
            s = "";
        }
          
          int t = 2;
        for(int n = 0;n<1;n++){
            for(int m=0;m < 3;m++){
                s += list[m][t--];
                
            }
            if(s.equals("KKK")){
                return "K";
            }else if(s.equals("BBB")){
                return "B";
            }
           //清空字符串
            s = "";
        }
        return "O";
    }
}