Java实现九宫格

import java.util.Scanner;

public class Sudoku {
    public static void main(String[] args) {
        System.out.println("请输入九宫格的行列规模(只能是奇数的):");
        Scanner scn = new Scanner(System.in);
        int n = Integer.parseInt(scn.nextLine());
        int arr[][] = new int[n][n];
        int a = 0;
        int b = (n-1) / 2;
        arr[a][b] = 1;
        for (int i = 2; i <= n*n; i++)
        {
            if(a==0 && b==n-1)
            {
                a++;
            }
            else if(a==0 && b>=0 && a<n-1)
            {
                a=n-1;
                b++;
            }
           else if(a>0 && a<=n-1 && b==n-1)
           {
                 b=0;
                 a--;
           }
           else if(arr[a-1][b+1]!=0)
           {
                 a++;
           }
           else
           {
                 b++;
                 a--;
           }
            arr[a][b]=i;
        }
        for(int ii = 0;ii<n;ii++)
        {
            for (int jj = 0; jj < n; jj++)
            {
                System.out.print(arr[ii][jj] + "\t");
            }
        System.out.println();
        }
    }
}