Java 生成螺旋矩阵代码实现

以下是一种生成螺旋矩阵的 Java 代码实现：

import java.util.Scanner;

public class SpiralMatrix {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入整数 n：");
        int n = scanner.nextInt();

        int[][] matrix = generateSpiralMatrix(n);
        System.out.println("生成的螺旋矩阵：");
        printMatrix(matrix);
    }

    public static int[][] generateSpiralMatrix(int n) {
        int[][] matrix = new int[n][n];
        int num = 1;
        int top = 0, bottom = n - 1, left = 0, right = n - 1;

        while (num <= n * n) {
            // 从左到右
            for (int i = left; i <= right; i++) {
                matrix[top][i] = num++;
            }
            top++;

            // 从上到下
            for (int i = top; i <= bottom; i++) {
                matrix[i][right] = num++;
            }
            right--;

            // 从右到左
            for (int i = right; i >= left; i--) {
                matrix[bottom][i] = num++;
            }
            bottom--;

            // 从下到上
            for (int i = bottom; i >= top; i--) {
                matrix[i][left] = num++;
            }
            left++;
        }

        return matrix;
    }

    public static void printMatrix(int[][] matrix) {
        for (int[] row : matrix) {
            for (int num : row) {
                System.out.printf("%3d ", num);
            }
            System.out.println();
        }
    }
}

运行结果示例：

请输入整数 n：5
生成的螺旋矩阵：
  1   2   3   4   5 
 16  17  18  19   6 
 15  24  25  20   7 
 14  23  22  21   8 
 13  12  11  10   9