这个还不是很懂用2维数组写的

贴代码

package com.sec.example;

import java.io.IOException;
import java.util.Calendar;
import java.util.Date;

public class Test {
    public static void main(String args[]) throws IOException {

        int order=0;
        System.out.print("Please input the order of the square(<10):");
        order = System.in.read();
        order = order-'0';
        Test arr=new Test(order);
        arr.Print();
    }





    private int N;  //矩阵的维数
    private int[][] array;
    Test(){
        N=5;
        array=new int[N][N];
    }
    Test(int n){
        N=n;
        array=new int[N][N];
    }
    public void Print(){
        int i=0,j=0,i0=0,j0=0,count=1,Num=N-1;
        while(Num>0) {
            for (i=i0,j=j0;j<Num;j++,count++) {
                array[i][j]=count;
            }
            for (i=i0;i<Num;i++,count++) {
                array[i][j]=count;
            }
            for (j=Num;j>j0;j--,count++) {
                array[i][j]=count;
            }
            for (i=Num;i>i0;i--,count++) {
                array[i][j]=count;
            }
            i0++;
            j0++;
            Num--;
        }
        if (N%2!=0) {  //矩阵的维数为奇数时，给矩阵中间的位置赋值
            array[N/2][N/2]=count;
        }
        for (i=0;i<N;i++) {
            for (j=0;j<N;j++) {
                String ar="0";
                if (array[i][j]/10<1) ar="  "+array[i][j];
                else if (array[i][j]/100<1 && array[i][j]/10>=1) {
                    ar=" "+array[i][j];
                }
                System.out.print(ar+" ");
            }
            System.out.println();
        }
    }


}