Example: Print Star Pattern without using loop in Java language

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// Print Star Pattern without using loop in Java language
import java.util.Scanner;

public class Main {

    public static int i = 1, r = 1;

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

        // size of the pattern
        int x;

        System.out.println("-----Enter the size of the pattern-----");
        x = in .nextInt();

        // This will print the pattern
        starPattern(x);
    }

    // It's the recursive function
    // to print the star pattern
    public static void starPattern(int n) {
        if ((int) Math.sqrt(Math.pow((i - (2 * n - 1) * (r - 1) - n), 2))<r) {
            System.out.print("*");
        } else {
            System.out.print(" ");
        }

        if ((i - (2 * n - 1) * (r - 1)) % (2 * n - 1) == 0) {
            System.out.print("\n");
            r++;
        }

        if (i++<n * (2 * n - 1))
            starPattern(n);
    }
}