Java Program to Print Sandglass Alphabets Pattern

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

package Alphabets;

import java.util.Scanner;

public class SandglassAlps1 {
	
	private static Scanner sc;
	
	public static void main(String[] args) {
		
		sc = new Scanner(System.in);	
		
		System.out.print("Enter Sandglass Pattern of Alphabets Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Sandglass Alphabets Pattern\n");
		int i, j, k, alphabet = 64;
		
		for (i = 1 ; i <= rows; i++ ) 
		{
			for (j = 1 ; j < i; j++ ) 
			{
				System.out.print(" ");
			}
			for(k = i; k <= rows ; k++) 
			{
				System.out.print((char)(alphabet + 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((char)(alphabet + k) + " ");
			}
			System.out.println();
		}
	}
}

This Java program prints the sandglass pattern of alphabets using a while loop.

package Alphabets;

import java.util.Scanner;

public class SandglassAlps2 {
	
	private static Scanner sc;
	
	public static void main(String[] args) {
		
		sc = new Scanner(System.in);	
		
		System.out.print("Enter Sandglass Pattern of Alphabets Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Sandglass Alphabets Pattern\n");
		int i, j, k, alphabet = 64;
		i = 1;
		
		while (i <= rows ) 
		{
			j = 1 ; 
			while(j < i ) 
			{
				System.out.print(" ");
				j++;
			}
			
			k = i;
			while( k <= rows ) 
			{
				System.out.print((char)(alphabet + 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((char)(alphabet + k) + " ");
				k++;
			}
			System.out.println();
			i--;
		}
	}
}

Enter Sandglass Pattern of Alphabets Rows = 13
Printing Sandglass Alphabets Pattern

A B C D E F G H I J K L M 
 B C D E F G H I J K L M 
  C D E F G H I J K L M 
   D E F G H I J K L M 
    E F G H I J K L M 
     F G H I J K L M 
      G H I J K L M 
       H I J K L M 
        I J K L M 
         J K L M 
          K L M 
           L M 
            M 
           L M 
          K L M 
         J K L M 
        I J K L M 
       H I J K L M 
      G H I J K L M 
     F G H I J K L M 
    E F G H I J K L M 
   D E F G H I J K L M 
  C D E F G H I J K L M 
 B C D E F G H I J K L M 
A B C D E F G H I J K L M 

This Java example uses the do while loop to display the sandglass pattern of alphabets.

package Alphabets;

import java.util.Scanner;

public class SandglassAlps3 {
	
	private static Scanner sc;
	
	public static void main(String[] args) {
		
		sc = new Scanner(System.in);	
		
		System.out.print("Enter Sandglass Pattern of Alphabets Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Sandglass Alphabets Pattern\n");
		int i, j, k, alphabet = 64;
		i = 1;
		
		do
		{
			j = 1 ; 
			do
			{
				System.out.print(" ");

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

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

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

Enter Sandglass Pattern of Alphabets Rows = 15
Printing Sandglass Alphabets Pattern

 A B C D E F G H I J K L M N O 
  B C D E F G H I J K L M N O 
   C D E F G H I J K L M N O 
    D E F G H I J K L M N O 
     E F G H I J K L M N O 
      F G H I J K L M N O 
       G H I J K L M N O 
        H I J K L M N O 
         I J K L M N O 
          J K L M N O 
           K L M N O 
            L M N O 
             M N O 
              N O 
               O 
              N O 
             M N O 
            L M N O 
           K L M N O 
          J K L M N O 
         I J K L M N O 
        H I J K L M N O 
       G H I J K L M N O 
      F G H I J K L M N O 
     E F G H I J K L M N O 
    D E F G H I J K L M N O 
   C D E F G H I J K L M N O 
  B C D E F G H I J K L M N O 
 A B C D E F G H I J K L M N O