Spiral matrix problem

import java.util.Scanner;

public class SpiralMatrix {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter the size of the matrix: ");
        int n = sc.nextInt();
        int[][] spiralMatrix = generateSpiralMatrix(n);
        printMatrix(spiralMatrix);
    }

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

        while (value <= n * n) {
            for (int i = left; i <= right; i++) {
                matrix[top][i] = value++;
            }
            top++;
            for (int i = top; i <= bottom; i++) {
                matrix[i][right] = value++;
            }
            right--;
            for (int i = right; i >= left; i--) {
                matrix[bottom][i] = value++;
            }
            bottom--;
            for (int i = bottom; i >= top; i--) {
                matrix[i][left] = value++;
            }
            left++;
        }

        return matrix;
    }

    public static void printMatrix(int[][] matrix) {
        for (int[] row : matrix) {
            for (int val : row) {
                System.out.printf("%4d", val);
            }
            System.out.println();
        }
    }
}

//Output :

 /* 1   2   3   4
   12  13  14   5
   11  16  15   6
   10   9   8   7 */