Java Program to Print Hollow Sandglass Star Pattern

Write a Java program to print hollow sandglass star pattern using for loop.

package Shapes3;

import java.util.Scanner;

public class HollowSandglassStar1 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		int i, j, k;
		
		System.out.print("Enter Hollow Sandglass Star Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Hollow Sandglass Star Pattern");
		
		for (i = 1; i <= rows; i++ ) 
		{
			for (j = 1; j < i; j++ ) 
			{
				System.out.print(" ");
			}
			for(k = i; k <= rows; k++) 
			{
				if(i == 1 || k == i || k == rows)
				{
					System.out.print("* ");
				}
				else 
				{
					System.out.print("  ");
				}
			}
			System.out.println();
		}
		
		for (i = rows - 1; i >= 1; i-- ) 
		{
			for (j = 1; j < i; j++ ) 
			{
				System.out.print(" ");
			}
			for(k = i; k <= rows; k++) 
			{
				if(i == 1 || k == i || k == rows)
				{
					System.out.print("* ");
				}
				else 
				{
					System.out.print("  ");
				}
			}
			System.out.println();
		}
	}
}

This Java program displays the hollow sandglass pattern of stars using a while loop.

package Shapes3;

import java.util.Scanner;

public class HollowSandglassStar2 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		int i, j, k;
		
		System.out.print("Enter Hollow Sandglass Star Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Hollow Sandglass Star Pattern");
		i = 1;
		while( i <= rows ) 
		{
			j = 1;
			while( j < i ) 
			{
				System.out.print(" ");
				j++;
			}
			k = i;
			while( k <= rows) 
			{
				if(i == 1 || k == i || k == rows)
				{
					System.out.print("* ");
				}
				else 
				{
					System.out.print("  ");
				}
				k++;
			}
			System.out.println();
			i++;
		}
		
		i = rows - 1;
		while( i >= 1 ) 
		{
			j = 1;
			while( j < i ) 
			{
				System.out.print(" ");
				j++;
			}
			k = i;
			while( k <= rows) 
			{
				if(i == 1 || k == i || k == rows)
				{
					System.out.print("* ");
				}
				else 
				{
					System.out.print("  ");
				}
				k++;
			}
			System.out.println();
			i--;
		}
	}
}

Enter Hollow Sandglass Star Pattern Rows = 7
Printing Hollow Sandglass Star Pattern
* * * * * * * 
 *         * 
  *       * 
   *     * 
    *   * 
     * * 
      * 
     * * 
    *   * 
   *     * 
  *       * 
 *         * 
* * * * * * * 

This Java Program uses the do while loop to print the hollow sandglass pattern of stars.

package Shapes3;

import java.util.Scanner;

public class HollowSandglassStar3 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		int i, j, k;
		
		System.out.print("Enter Hollow Sandglass Star Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Hollow Sandglass Star Pattern");
		i = 1;
		do 
		{
			j = 1;
			do
			{
				System.out.print(" ");
			} while( j++ <= i );
			k = i;
			do 
			{
				if(i == 1 || k == i || k == rows)
				{
					System.out.print("* ");
				}
				else 
				{
					System.out.print("  ");
				}
			} while( ++k <= rows);
			System.out.println();
		} while(++i <= rows );
		
		i = rows - 1;
		do 
		{
			j = 1;
			do 
			{
				System.out.print(" ");
			} while( j++ <= i );
			k = i;
			do 
			{
				if(i == 1 || k == i || k == rows)
				{
					System.out.print("* ");
				}
				else 
				{
					System.out.print("  ");
				}
			} while( ++k <= rows);
			System.out.println();
		} while(--i >= 1 );
	}
}

Enter Hollow Sandglass Star Pattern Rows = 11
Printing Hollow Sandglass Star Pattern
  * * * * * * * * * * * 
   *                 * 
    *               * 
     *             * 
      *           * 
       *         * 
        *       * 
         *     * 
          *   * 
           * * 
            * 
           * * 
          *   * 
         *     * 
        *       * 
       *         * 
      *           * 
     *             * 
    *               * 
   *                 * 
  * * * * * * * * * * *

In this Java example, HollowSandglassPattern function allows user to enter the character and prints the hollow sandglass pattern of the given character.

package Shapes3;

import java.util.Scanner;

public class HollowSandglassStar4 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Enter Hollow Sandglass Star Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.print("Enter Character for Hollow Sandglass Pattern = ");
		char ch = sc.next().charAt(0);
		
		System.out.println("Printing Hollow Sandglass Star Pattern");
		HollowSandglassPattern(rows, ch);
		
	}
	public static void HollowSandglassPattern(int rows, char ch) 
	{
		int i, j, k;
		
		for (i = 1; i <= rows; i++ ) 
		{
			for (j = 1; j < i; j++ ) 
			{
				System.out.print(" ");
			}
			for(k = i; k <= rows; k++) 
			{
				if(i == 1 || k == i || k == rows)
				{
					System.out.print(ch + " ");
				}
				else 
				{
					System.out.print("  ");
				}
			}
			System.out.println();
		}
		
		for (i = rows - 1; i >= 1; i-- ) 
		{
			for (j = 1; j < i; j++ ) 
			{
				System.out.print(" ");
			}
			for(k = i; k <= rows; k++) 
			{
				if(i == 1 || k == i || k == rows)
				{
					System.out.print(ch + " ");
				}
				else 
				{
					System.out.print("  ");
				}
			}
			System.out.println();
		}
	}
}

Enter Hollow Sandglass Star Pattern Rows = 15
Enter Character for Hollow Sandglass Pattern = &
Printing Hollow Sandglass Star Pattern
& & & & & & & & & & & & & & & 
 &                         & 
  &                       & 
   &                     & 
    &                   & 
     &                 & 
      &               & 
       &             & 
        &           & 
         &         & 
          &       & 
           &     & 
            &   & 
             & & 
              & 
             & & 
            &   & 
           &     & 
          &       & 
         &         & 
        &           & 
       &             & 
      &               & 
     &                 & 
    &                   & 
   &                     & 
  &                       & 
 &                         & 
& & & & & & & & & & & & & & &