Java program to Print Sandglass Star Pattern

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

package ShapePrograms2;

import java.util.Scanner;

public class Sandglass1 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		int i, j, k;
		
		System.out.print("Please Enter Sandglass Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Sandglass Star Pattern");
		
		for (i = 0 ; i <= rows - 1; i++ ) 
		{
			for (j = 0 ; j < i; j++ ) 
			{
				System.out.print(" ");
			}
			for(k = i; k <= rows - 1; k++) 
			{
				System.out.print("* ");
			}
			System.out.println();
		}
		
		for (i = rows - 1; i >= 0; i-- ) 
		{
			for (j = 0 ; j < i; j++ ) 
			{
				System.out.print(" ");
			}
			for(k = i; k <= rows - 1; k++) 
			{
				System.out.print("* ");
			}
			System.out.println();
		}
	}
}

This Java example displays the stars in a sandglass structure or pattern using a while loop.

package ShapePrograms2;

import java.util.Scanner;

public class Sandglass2 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Please Enter Sandglass Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Sandglass Star Pattern");
		int i = 0, j, k;
		
		while (i <= rows - 1) 
		{
			j = 0 ;
			while(j < i ) 
			{
				System.out.print(" ");
				j++;
			}
			
			k = i;
			while( k <= rows - 1) 
			{
				System.out.print("* ");
				k++;
			}
			System.out.println();
			i++;
		}
		
		i = rows - 1;
		while ( i >= 0 ) 
		{
			j = 0 ;
			while ( j < i) 
			{
				System.out.print(" ");
				j++;
			}
			
			k = i;
			while(k <= rows - 1) 
			{
				System.out.print("* ");
				k++;
			}
			System.out.println();
			i--;
		}
	}
}

Please Enter Sandglass Pattern Rows = 8
Printing Sandglass Star Pattern
* * * * * * * * 
 * * * * * * * 
  * * * * * * 
   * * * * * 
    * * * * 
     * * * 
      * * 
       * 
       * 
      * * 
     * * * 
    * * * * 
   * * * * * 
  * * * * * * 
 * * * * * * * 
* * * * * * * * 

Java program to print sandglass star pattern using do while loop

package ShapePrograms2;

import java.util.Scanner;

public class Sandglass3 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Please Enter Sandglass Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Sandglass Star Pattern");
		int i = 0, j, k;
		
		do
		{
			j = 0 ;
			do
			{
				System.out.print(" ");

			} while(j++ < i );
			
			k = i;
			do
			{
				System.out.print("* ");

			} while( ++k <= rows - 1);
			
			System.out.println();

		} while (++i <= rows - 1);
		
		i = rows - 1;
		do
		{
			j = 0 ;
			do 
			{
				System.out.print(" ");

			} while ( j++ < i);
			
			k = i;
			do
			{
				System.out.print("* ");

			} while(++k <= rows - 1);
			
			System.out.println();

		} while ( --i >= 0 );
	}
}

Please Enter Sandglass Pattern Rows = 9
Printing Sandglass Star Pattern
 * * * * * * * * * 
  * * * * * * * * 
   * * * * * * * 
    * * * * * * 
     * * * * * 
      * * * * 
       * * * 
        * * 
         * 
         * 
        * * 
       * * * 
      * * * * 
     * * * * * 
    * * * * * * 
   * * * * * * * 
  * * * * * * * * 
 * * * * * * * * * 

In this Java example, the SandglassPattern function prints a given symbol’s sandglass pattern.

package ShapePrograms2;

import java.util.Scanner;

public class Sandglass4 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Please Enter Sandglass Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.print("Enter Character for Sandglass Pattern = ");
		char ch = sc.next().charAt(0);
		
		System.out.println("Printing Sandglass Star Pattern");
		SandglassPattern(rows, ch);		
	}
	
	public static void SandglassPattern(int rows, char ch) {
		
		int i, j, k;
		
		for (i = 0 ; i <= rows - 1; i++ ) 
		{
			for (j = 0 ; j < i; j++ ) 
			{
				System.out.print(" ");
			}
			for(k = i; k <= rows - 1; k++) 
			{
				System.out.print(ch + " ");
			}
			System.out.println();
		}
		
		for (i = rows - 1; i >= 0; i-- ) 
		{
			for (j = 0 ; j < i; j++ ) 
			{
				System.out.print(" ");
			}
			for(k = i; k <= rows - 1; k++) 
			{
				System.out.print(ch + " ");
			}
			System.out.println();
		}
	}
}

Please Enter Sandglass Pattern Rows = 10
Enter Character for Sandglass Pattern = @
Printing Sandglass Star Pattern
@ @ @ @ @ @ @ @ @ @ 
 @ @ @ @ @ @ @ @ @ 
  @ @ @ @ @ @ @ @ 
   @ @ @ @ @ @ @ 
    @ @ @ @ @ @ 
     @ @ @ @ @ 
      @ @ @ @ 
       @ @ @ 
        @ @ 
         @ 
         @ 
        @ @ 
       @ @ @ 
      @ @ @ @ 
     @ @ @ @ @ 
    @ @ @ @ @ @ 
   @ @ @ @ @ @ @ 
  @ @ @ @ @ @ @ @ 
 @ @ @ @ @ @ @ @ @ 
@ @ @ @ @ @ @ @ @ @