Hollow Pyramid Pattern in Java using nested while

In this tutorial, we will discuss Hollow Pyramid Pattern in Java using nested while loop

In this program, we are going to learn about how to display Pyramid Pattern in Java using nested while loop in Java programming language

Here, we display an Hollow Pyramid Pattern program with coding using nested while loop and also program get input from the user using Scanner class function in Java language

The user can provide numbers as they wish and get the Hollow pyramid pattern according to their input.

Hollow Pyuramid Triangle Pattern 1

Program 1

Hollow Pyramid triangle star pattern

import java.util.Scanner;//import the scanner class 
class Pyramid_WhileH1{ 
public static void main(String args[]){ 
Scanner scan=new Scanner(System.in);
//create a scanner object 
System.out.print("Enter the number of rows"); 
int rows=scan.nextInt();

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

    k=1;
while(k<2*i){
    if(i==rows || (k==1 || k==2*i-1))
        System.out.print("*");
    else
        System.out.print(" ");
    k++;
}
i++;
System.out.print("\n");//Move to the next line for print
    }
}
}

When the above code is executed, it produces the following results

Hollow Pyuramid Triangle Pattern 2

Program 2

Inverted Hollow Pyramid triangle star pattern

import java.util.Scanner;//import the scanner class 
class Pyramid_WhileH{ 
public static void main(String args[]){ 
Scanner scan=new Scanner(System.in);
//create a scanner object 
System.out.print("Enter the number of rows"); 
int rows=scan.nextInt();

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

    k=1;
while(k<2*i){
    if(i==rows || (k==1 || k==2*i-1))
        System.out.print("*");
    else
        System.out.print(" ");
    k++;
}
i--;
System.out.print("\n");//Move to the next line for print
    }
}
}

When the above code is executed, it produces the following results