Java Program to Print Hollow Pyramid Star Pattern

Write a Java Program to print hollow pyramid star pattern using for loop. This pattern example uses two if-else statements and two for loops nested inside another to iterate and display a hollow pyramid.

package ShapePrograms;

import java.util.Scanner;

public class HollowPyramidPattern1 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Please Enter Hollow Pyramid Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("---- Printing Hollow Pyramid Pattern of Stars ----");
		int i, j, k;
		
		for (i = 1 ; i <= rows; i++ ) 
		{
			for (j = 1 ; j <= rows - i; j++ ) 
			{
				System.out.print(" ");
			}
			if(i == 1 || i == rows) {
				for (k = 1 ; k <= (i * 2) - 1; k++ ) 
				{
					System.out.print("*");
				}
			}
			else {
				for (k = 1; k <= (i * 2) - 1; k++ ) 
				{
					if(k == 1 || k == i * 2 - 1) {
						System.out.print("*");
					}
					else {
						System.out.print(" ");
					}
				}
			}		
			System.out.println();
		}
	}
}

Please Enter Hollow Pyramid Pattern Rows = 8
---- Printing Hollow Pyramid Pattern of Stars ----
       *
      * *
     *   *
    *     *
   *       *
  *         *
 *           *
***************

We simplified the above code and removed the extra if-else to display the hollow pyramid star pattern.

package ShapePrograms;

import java.util.Scanner;

public class HollowPyramidPattern2 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);	
		
		System.out.print("Please Enter Hollow Pyramid Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Hollow Pyramid Pattern of Stars");
		
		int i, j, k;		
		for (i = 1 ; i <= rows; i++ ) 	
		{
			for (j = 1 ; j <= rows - i; j++ ) 	
			{
				System.out.print(" ");
			}
			for (k = 1; k <= (i * 2) - 1; k++ ) 
			{
				if(k == 1 || k == i * 2 - 1 || i == rows) {
					System.out.print("*");
				}	
				else {
					System.out.print(" ");
				}
			}		
			System.out.println();
		}
	}
}

In this hollow pyramid star pattern program, we replaced the for loops with while loops.

package ShapePrograms;

import java.util.Scanner;

public class HollowPyramidPattern3 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Please Enter Hollow Pyramid Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Hollow Pyramid Pattern of Stars");
		int i = 1, j, k;
		
		while( i <= rows) 
		{
			j = 1 ;
			while ( j <= rows - i ) 
			{
				System.out.print(" ");
				j++;
			}
			k = 1;
			while ( k <= (i * 2) - 1) 
			{
				if(k == 1 || k == i * 2 - 1 || i == rows) 
				{
					System.out.print("*");
				}
				else {
					System.out.print(" ");
				}
				k++ ;
			}		
			System.out.println();
			i++;
		}
	}
}

Please Enter Hollow Pyramid Pattern Rows = 10
Printing Hollow Pyramid Pattern of Stars
         *
        * *
       *   *
      *     *
     *       *
    *         *
   *           *
  *             *
 *               *
*******************

Java Program to Print Hollow Pyramid Star Pattern using do while loop

package ShapePrograms;

import java.util.Scanner;

public class HollowPyramidPattern4 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Please Enter Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Hollow Pyramid Pattern of Stars");
		int i = 1, j, k;
		
		do 
		{
			j = 1 ;
			do
			{
				System.out.print(" ");
			} while (++j <= rows - i + 1);
			k = 1;
			do
			{
				if(k == 1 || k == i * 2 - 1 || i == rows) 
				{
					System.out.print("*");
				}
				else {
					System.out.print(" ");
				}
			} while ( ++k <= (i * 2) - 1);	
			System.out.println();
		} while( ++i <= rows);
	}
}

Please Enter Rows = 13
Printing Hollow Pyramid Pattern of Stars
             *
            * *
           *   *
          *     *
         *       *
        *         *
       *           *
      *             *
     *               *
    *                 *
   *                   *
  *                     *
 *************************

In this example, the HollowMirroredRhombusPat function prints the hollow pyramid pattern of a given symbol.

package ShapePrograms;

import java.util.Scanner;

public class HollowPyramidPattern5 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		
		System.out.print("Please Enter Rows = ");
		int rows = sc.nextInt();
		
		System.out.print("Enter Character for Hollow Pyramid Pattern = ");
		char ch = sc.next().charAt(0);
		
		System.out.println("---- Printing Hollow Pyramid Pattern ----");
		HollowPyramidPatternPat(rows, ch);		
	}
	
	public static void HollowPyramidPatternPat(int rows, char ch) {
		int i, j, k;
		
		for (i = 1 ; i <= rows; i++ ) 
		{
			for (j = 1 ; j <= rows - i; j++ ) 
			{
				System.out.print(" ");
			}
			for (k = 1; k <= (i * 2) - 1; k++ ) 
			{
				if(k == 1 || k == i * 2 - 1 || i == rows) 
				{
					System.out.print(ch);
				}
				else {
					System.out.print(" ");
				}
			}		
			System.out.println();
		}
	}
}

Please Enter Rows = 15
Enter Character for Hollow Pyramid Pattern = #
---- Printing Hollow Pyramid Pattern ----
              #
             # #
            #   #
           #     #
          #       #
         #         #
        #           #
       #             #
      #               #
     #                 #
    #                   #
   #                     #
  #                       #
 #                         #
#############################