Diamond

import java.util.Scanner;

public class Diamond {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        System.out.print("Enter your number: ");
        int n = Integer.parseInt(sc.nextLine());

        repeatStr(n, ".");
        repeatStr(3 * n, "*");
        repeatStr(n, ".");
        System.out.println();

        for (int row = 1; row < n; row++) {
            repeatStr(n - row, ".");
            System.out.print("*");
            repeatStr(2 * row + 3 * n - 2, ".");
            System.out.print("*");
            repeatStr(n - row, ".");
            System.out.println();
        }

        repeatStr(5 * n, "*");
        System.out.println();

        for (int row = 2 * n; row > 0; row--) {
            repeatStr(2 * n + 1 - row, ".");
            System.out.print("*");
            repeatStr(2 * row + n - 4, ".");
            System.out.print("*");
            repeatStr(2 * n + 1 - row, ".");
            System.out.println();
        }

        repeatStr(2 * n + 1, ".");
        repeatStr(n - 2, "*");
        repeatStr(2 * n + 1, ".");
    }

    static void repeatStr(int m, String str) {

        for (int i = 0; i < m; i++) {
            System.out.print(str);
        }

    }