Square Spiral Matrix of Numbers

/* Write a program that reads from the console a positive integer number n (1 ≤ n ≤ 20)
 * and prints a matrix holding the numbers from 1 to n*n in the form of square spiral. */

import java.util.Scanner;

public class _19_PrintSquareSpiralMatrixOfNumbers {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner scan = new Scanner(System.in);
        System.out.print("Enter a whole positve number in the range [1 .. 20] for N: ");
        int numN = scan.nextInt();
        scan.close();

        if (numN > 0 && numN <= 20) {
            int[][] matrix = new int[numN][numN];
            int row = 0, col = 0;
            int maxValue = numN * numN;
            String direction = "right";

            for (int i = 1; i <= maxValue; i++) {
                matrix[row][col] = i;
                if (direction == "right" && (col + 1 == numN || matrix[row][col + 1] != 0)) {
                    direction = "down";
                }

                if (direction == "down") {
                    if (row + 1 == numN || matrix[row + 1][col] != 0) {
                        direction = "left";
                    } else {
                        row++;
                    }
                }

                if (direction == "left") {
                    if (col == 0 || matrix[row][col - 1] != 0) {
                        direction = "up";
                    } else {
                        col--;
                    }
                }

                if (direction == "up") {
                    if (row == 0 || matrix[row - 1][col] != 0) {
                        direction = "right";
                    } else {
                        row--;
                    }
                }

                if (direction == "right") {
                    col++;
                }
            }

            System.out.println("The Square Spiral Matrix of Numbers is:");
            for (int rows = 0; rows < matrix.length; rows++) {
                for (int cols = 0; cols < matrix[0].length; cols++) {
                    System.out.printf("%4d", matrix[rows][cols]);
                }

                System.out.println();
            }

        } else {
            System.out.println("Error! - Invalid Input number!!!");
        }
    }

}