Java-Pattern-Problems/HollowDiamondPyramid.java at main · ArpanC6/Java-Pattern-Problems · GitHub

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// Hollow Diamond Star without using function

import java.util.Scanner;

public class HollowDiamondPyramid {
    public static void main(String args[]) {
        Scanner s = new Scanner(System.in);
        System.out.print("Enter the number: ");
        int num = s.nextInt();;
        int i, j;


        for (i = 1; i <= num; i++) {

            for (j = 1; j <= num - i; j++) {
                System.out.print(" ");
            }
             for (j = 1; j <= 2 * i - 1; j++) {
                if (j == 1 || j == 2 * i - 1)
                    System.out.print("*");
                else
                    System.out.print(" ");
            }
            System.out.println();
        }
        for (i = num - 1; i >= 1; i--) {
            for (j = 1; j <= num - i; j++) {
                System.out.print(" ");
            }
            for (j = 1; j <= 2 * i - 1; j++) {
                if (j == 1 || j == 2 * i - 1)
                    System.out.print("*");
                else
                    System.out.print(" ");
            }
            System.out.println();
        }
    }
}