Java program to Print Sandglass Number Pattern

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

import java.util.Scanner;

public class SandglassNumber1 {
	
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		int i, j, k;
		
		System.out.print("Enter Sandglass Number Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Sandglass Number Pattern");
		
		for (i = 1 ; i <= rows; i++ ) 
		{
			for (j = 1 ; j < i; j++ ) 
			{
				System.out.print(" ");
			}
			for(k = i; k <= rows ; k++) 
			{
				System.out.print(k + " ");
			}
			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++) 
			{
				System.out.print(k + " ");
			}
			System.out.println();
		}
	}
}

This Java example displays the numbers in a sandglass pattern using a while loop.

import java.util.Scanner;

public class SandglassNumber2 {
	
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Enter Sandglass Number Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Sandglass Number Pattern");
		int i = 1, j, k;
		
		while (i <= rows ) 
		{
			j = 1 ; 
			while(j < i ) 
			{
				System.out.print(" ");
				j++;
			}
			
			k = i;
			while( k <= rows ) 
			{
				System.out.print(k + " ");
				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) 
			{
				System.out.print(k + " ");
				k++;
			}
			System.out.println();
			i--;
		}
	}
}

Enter Sandglass Number Pattern Rows = 6
Printing Sandglass Number Pattern
1 2 3 4 5 6 
 2 3 4 5 6 
  3 4 5 6 
   4 5 6 
    5 6 
     6 
    5 6 
   4 5 6 
  3 4 5 6 
 2 3 4 5 6 
1 2 3 4 5 6 

Java program to print sandglass number pattern using do while loop.

import java.util.Scanner;

public class SandglassNumber3 {
	
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Enter Sandglass Number Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Sandglass Number Pattern");
		int i = 1, j, k;
		
		do
		{
			j = 1 ; 
			do
			{
				System.out.print(" ");

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

			} 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
			{
				System.out.print(k + " ");

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

		} while( --i >= 1 ) ;
	}
}

Enter Sandglass Number Pattern Rows = 9
Printing Sandglass Number Pattern
 1 2 3 4 5 6 7 8 9 
  2 3 4 5 6 7 8 9 
   3 4 5 6 7 8 9 
    4 5 6 7 8 9 
     5 6 7 8 9 
      6 7 8 9 
       7 8 9 
        8 9 
         9 
        8 9 
       7 8 9 
      6 7 8 9 
     5 6 7 8 9 
    4 5 6 7 8 9 
   3 4 5 6 7 8 9 
  2 3 4 5 6 7 8 9 
 1 2 3 4 5 6 7 8 9