从键盘输入一个整数（1~20），则以该数字为矩阵，将数字按照顺时针螺旋填入其中

package array;

import java.util.Scanner;

/**
 * @author 苗晓强
 * @date 2023/7/26 23:56
 * 回形数：
 * 从键盘输入一个整数（1~20），则以该数字为矩阵，将数字按照顺时针螺旋填入其中
 */
public class RectangleTest {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入一个数字：");
        int len = scanner.nextInt();
        int [][] arrays = new int[len][len];

        int s = len * len;
        //k = 1 right 2 down 3 left 4 up
        int k = 1;
        int i = 0,j = 0;
        for (int m = 1; m <= s; m++){
            if (k == 1){
                if (j < len && arrays[i][j] == 0){
                    arrays[i][j++] = m;
                }else {
                    k = 2;
                    i++;
                    j--;
                    m--;
                }
            }else if (k == 2){
                if (i < len && arrays[i][j] == 0){
                    arrays[i++][j] = m;
                }else {
                    k = 3;
                    i--;
                    j--;
                    m--;
                }
            }else if (k == 3){
                if (j >= 0 && arrays[i][j] == 0){
                    arrays[i][j--] = m;
                }else {
                    k = 4;
                    i--;
                    j++;
                    m--;
                }
            }else if (k == 4){
                if (i >= 0 && arrays[i][j] == 0){
                    arrays[i--][j] = m;
                }else {
                    k = 1;
                    i++;
                    j++;
                    m--;
                }
            }
        }
        //遍历
        for (int m = 0; m < arrays.length; m++){
            for (int n = 0; n < arrays[m].length; n++){
                System.out.print(arrays[m][n] + "\t");
            }
            System.out.println();
        }
    }
}