Java實現簡單的正方形

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import java.util.Scanner;public class Main {    public static void main(String[] args) {        Scanner sc = new Scanner (System.in);        int n = sc.nextInt();        int count = 1;        int[][] a = new int[n][n];        for(int i = 0 ; i <=a.length/2;i++) {            for(int j = i ;j <a.length-i;j++) {                a[i][j] = count++;             }            for(int k = i+1;k<a.length-i;k++) {                a[k][a.length-i-1] = count++;            }            for(int j = a.length-i-2;j>=i;j--) {                a[a.length-i-1][j] = count++;            }            for(int k = a.length-i-2 ; k>=i+1 ; k--) {                a[k][i] = count++;            }        }        for(int i = 0 ; i <a.length;i++) {            for(int j = 0 ;j<a[i].length;j++) {                System.out.printf("%4d",a[i][j]);            }            System.out.println();        }        System.out.println();                    }}

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Java實現簡單的正方形