Java Program to Print Hollow Right Pascals Star Triangle

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

package ShapePrograms2;

import java.util.Scanner;

public class HollowRightPascal1 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		int i, j, k;
		
		System.out.print("Enter Hollow Right Pascals Triangle Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Hollow Right Pascals Triangle Star Pattern");
		
		for (i = 1 ; i <= rows; i++ ) 
		{
			for (j = 1 ; j <= i; j++ ) 
			{
				if(j == 1 || j == i) {
					System.out.print("*");
				}
				else {
					System.out.print(" ");
				}
			}
			System.out.println();
		}
		
		for (i = 1; i <= rows - 1; i++ ) 
		{
			for (j = rows -  1; j >= i; j-- ) 
			{
				if(j == rows - 1 || j == i || i == rows) {
					System.out.print("*");
				}
				else {
					System.out.print(" ");
				}
			}
			for(k = 1; k < i; k++)
			{
				System.out.print(" ");
			}
			System.out.println();
		}
	}
}
Java Program to Print Hollow Right Pascals Star Triangle

This Java example displays the stars in a hollow right pascals triangle pattern using a while loop.

package ShapePrograms2;

import java.util.Scanner;

public class HollowRightPascal2 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Enter Hollow Right Pascals Triangle Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Hollow Right Pascals Triangle Star Pattern");
		int i = 1, j, k;
		
		while ( i <= rows ) 
		{
			j = 1 ;
			while ( j <= i ) 
			{
				if(j == 1 || j == i) {
					System.out.print("*");
				}
				else {
					System.out.print(" ");
				}
				j++;
			}
			System.out.println();
			i++;
		}
		
		i = 1;
		while ( i <= rows - 1 ) 
		{
			j = rows -  1;
			while ( j >= i ) 
			{
				if(j == rows - 1 || j == i || i == rows) {
					System.out.print("*");
				}
				else {
					System.out.print(" ");
				}
				j--;
			}
			k = 1;
			while( k < i)
			{
				System.out.print(" ");
				k++;
			}
			System.out.println();
			i++;
		}
	}
}
Enter Hollow Right Pascals Triangle Pattern Rows = 8
Printing Hollow Right Pascals Triangle Star Pattern
*
**
* *
*  *
*   *
*    *
*     *
*      *
*     *
*    * 
*   *  
*  *   
* *    
**     
*

Java program to print hollow right pascals star triangle using do while loop.

package ShapePrograms2;

import java.util.Scanner;

public class HollowRightPascal3 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Enter Hollow Right Pascals Triangle Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Hollow Right Pascals Triangle Star Pattern");
		int i = 1, j, k;
		
		do
		{
			j = 1 ;
			do
			{
				if(j == 1 || j == i) {
					System.out.print("*");
				}
				else {
					System.out.print(" ");
				}

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

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

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

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

		} while ( ++i <= rows - 1 ) ;
	}
}
Enter Hollow Right Pascals Triangle Pattern Rows = 11
Printing Hollow Right Pascals Triangle Star Pattern
*
**
* *
*  *
*   *
*    *
*     *
*      *
*       *
*        *
*         *
*        * 
*       * 
*      *  
*     *   
*    *    
*   *     
*  *      
* *       
**        
*

About Suresh

Suresh is the founder of TutorialGateway and a freelance software developer. He specialized in Designing and Developing Windows and Web applications. The experience he gained in Programming and BI integration, and reporting tools translates into this blog. You can find him on Facebook or Twitter.