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