Java program to print the following spiral pattern on the console

Java program to print the following spiral pattern on the console

public class GFG

{

 

    public static void printSpiral(int size)

    {

 

        // Create row and col

        // to traverse rows and columns

        int row = 0, col = 0;

 

        int boundary = size - 1;

        int sizeLeft = size - 1;

        int flag = 1;

 

        // Variable to determine the movement

        // r = right, l = left, d = down, u = upper

        char move = 'r';

 

        // Array  for matrix

        int matrix[][] = new int[size][size];

 

        for (int i = 1; i < size * size + 1; i++) {

 

            // Assign the value

            matrix[row][col] = i;

 

            // switch-case to determine the next index

            switch (move) {

 

            // If right, go right

            case 'r':

                col += 1;

                break;

 

            // if left, go left

            case 'l':

                col -= 1;

                break;

 

            // if up, go up

            case 'u':

                row -= 1;

                break;

 

            // if down, go down

            case 'd':

                row += 1;

                break;

            }

 

            // Check if the matrix

            // has reached array boundary

            if (i == boundary) {

 

                // Add the left size for the next boundary

                boundary += sizeLeft;

 

                // If 2 rotations has been made,

                // decrease the size left by 1

                if (flag != 2) {

 

                    flag = 2;

                }

                else {

 

                    flag = 1;

                    sizeLeft -= 1;

                }

 

                // switch-case to rotate the movement

                switch (move) {

 

                // if right, rotate to down

                case 'r':

                    move = 'd';

                    break;

 

                // if down, rotate to left

                case 'd':

                    move = 'l';

                    break;

 

                // if left, rotate to up

                case 'l':

                    move = 'u';

                    break;

 

                // if up, rotate to right

                case 'u':

                    move = 'r';

                    break;

                }

            }

        }

 

        // Print the matrix

        for (row = 0; row < size; row++) {

            for (col = 0; col < size; col++) {

 

                int n = matrix[row][col];

                System.out.print((n < 10)

                                     ? (n + "  ")

                                     : (n + " "));

            }

 

            System.out.println();

        }

    }

 

    // Driver Code

    public static void main(String[] args)

    {

 

        // Get the size of size

        int size = 10;

 

        // Print the Spiral Pattern

        printSpiral(size);

    }

}

OUTPUT:-