Write a program in Java create a double dimensional array of size nxn matrix form and fill the numbers in a circular fashion (anticlock-wise) with natural numbers from 1 to n², as illustrated below:

For example, if n = 5, then n² = 25, then the array is filled as:

21	20	19	18	17
22	7	6	5	16
23	8	1	4	15
24	9	2	3	14
25	10	11	12	13

import java.util.Scanner;

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

        if (n % 2 == 0) {
            System.out.println("Invalid Input! Size must be an odd number");
            return;
        }
        
        int val  = 1;
        int arr[][] = new int[n][n]; 

        int x = n / 2;
        int y = n / 2;
        int d = 1;
        int c = 0;
        int s = 1;
        
        for (int k = 1; k <= (n - 1); k++) {
            for (int j = 0; j < (k < n - 1 ? 2 : 3); j++) {
                for (int i = 0; i < s; i++) {
                    arr[x][y] = val++;
                    
                    switch (d) {
                        case 0:
                        y = y - 1;
                        break;
                        
                        case 1:
                        x = x + 1;
                        break;
                        
                        case 2:
                        y = y + 1;
                        break;
                        
                        case 3:
                        x = x - 1;
                        break;
                    }
                }
                
                d = (d + 1) % 4;
            }
            
            s = s + 1;
        }
        
        arr[n-1][0] = val;

        System.out.println("Circular Matrix AntiClockwise:");
        
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < n; j++) {
                System.out.print(arr[i][j] + "\t");
            }
            System.out.println();
        }
    }
}