Java Program to Print Hollow Left Pascals Star Triangle

Write a Java program to print hollow left pascals star triangle using for loop. 

package ShapePrograms2;

import java.util.Scanner;

public class HollowLeftPascal1 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		int i, j, k;
		
		System.out.print("Enter Hollow Left Pascals Triangle Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Hollow Left Pascals Triangle Star Pattern");
		
		for (i = 1 ; i <= rows; i++ ) 
		{
			for (j = rows ; j > i; j-- ) 
			{
				System.out.print(" ");
			}
			for(k = 1; k <= i; k++) 
			{
				if(k == 1 || k == i) {
					System.out.print("*");
				}
				else {
					System.out.print(" ");
				}
			}
			System.out.println();
		}
		
		for (i = 1; i <= rows - 1; i++ ) 
		{
			for (j = 1 ; j <= i; j++ ) 
			{
				System.out.print(" ");
			}
			for(k = rows - 1; k >= i; k--) 
			{
				if(k == rows - 1 || k == i) {
					System.out.print("*");
				}
				else {
					System.out.print(" ");
				}
			}
			System.out.println();
		}
	}
}

This Java example prints the stars in a hollow left pascals triangle pattern using a while loop.

package ShapePrograms2;

import java.util.Scanner;

public class HollowLeftPascal2 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Enter Hollow Left Pascals Triangle Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Hollow Left Pascals Triangle Star Pattern");
		int i = 1, j, k;
		
		while (i <= rows ) 
		{
			j = rows ;
			while ( j > i) 
			{
				System.out.print(" ");
				j-- ;
			}
			k = 1;
			while( k <= i) 
			{
				if(k == 1 || k == i) {
					System.out.print("*");
				}
				else {
					System.out.print(" ");
				}
				k++;
			}
			System.out.println();
			i++;
		}
		
		i = 1;
		while ( i <= rows - 1 ) 
		{
			j = 1 ;
			while ( j <= i ) 
			{
				System.out.print(" ");
				j++;
			}
			
			k = rows - 1;
			while( k >= i) 
			{
				if(k == rows - 1 || k == i) {
					System.out.print("*");
				}
				else {
					System.out.print(" ");
				}
				k--;
			}
			System.out.println();
			i++;
		}
	}
}

Enter Hollow Left Pascals Triangle Pattern Rows = 8
Printing Hollow Left Pascals Triangle Star Pattern
       *
      **
     * *
    *  *
   *   *
  *    *
 *     *
*      *
 *     *
  *    *
   *   *
    *  *
     * *
      **
       *

Java program to display hollow left pascals star triangle using do while loop.

package ShapePrograms2;

import java.util.Scanner;

public class HollowLeftPascal3 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Enter Hollow Left Pascals Triangle Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Hollow Left Pascals Triangle Star Pattern");
		int i = 1, j, k;
		
		do
		{
			j = rows ;
			do 
			{
				System.out.print(" ");

			} while ( j-- > i);
			k = 1;
			do
			{
				if(k == 1 || k == i) {
					System.out.print("*");
				}
				else {
					System.out.print(" ");
				}

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

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

			} while ( j++ <= i );
			
			k = rows - 1;
			do 
			{
				if(k == rows - 1 || k == i) {
					System.out.print("*");
				}
				else {
					System.out.print(" ");
				}

			} while( --k >= i);
			System.out.println();

		} while ( ++i <= rows - 1 );
	}
}

Enter Hollow Left Pascals Triangle Pattern Rows = 10
Printing Hollow Left Pascals Triangle Star Pattern
          * 
         ** 
        * * 
       *  * 
      *   * 
     *    * 
    *     * 
   *      * 
  *       * 
 *        * 
  *       *
   *      *
    *     *
     *    *
      *   *
       *  *
        * *
         **
          *