HollowHourglassPattern.java

import java.util.Scanner;

public class HollowHourglassPattern  {
    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 < i; j++) {
                System.out.print(" ");
            }

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

            System.out.println();
        }

        for (i = num - 1; i >= 1; i--) {
           
            for (j = 1; j < i; j++) {
                System.out.print(" ");
            }

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

            System.out.println();
        }
    }
}