Hollow Triangle star Pattern using while loop in Java

Hollow Triangle star Pattern  using nested while loop in Java

In this tutorial, we will discuss the Hollow Triangle star Pattern in Java using nested while loop

In this program, we are going to learn about how to display  Hollow Tringle star pattern using nested while loop in Java programming  language

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

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

Floyd’s triangle star pattern 1

Program 1

import java.util.Scanner;//import the scanner class 
class Triangle_While1{ 
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;
    i=1;
    while(i<=rows){
        j=1;
        while(j<=i){
        System.out.print(" ");
        
    if(j==1 || j==i ||i==rows )
        System.out.print("*");
    else
        System.out.print(" ");
    j++;;
}
i++;
System.out.print("\n");//Move to the next line for print
    }
}
}

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

Floyd’s triangle star pattern 2

Program 2

import java.util.Scanner;//import the scanner class 
class Triangle_While2{ 
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;
    i=1;
    while(i<=rows){
        j=i;
        while(j<rows){
        System.out.print(" ");
        j++;
        }
        j=1;
        while(j<=i){
        
    if(j==i || j==1 ||i==rows )
        System.out.print("*");
    else
        System.out.print(" ");
    j++;;
        }
        i++;
System.out.print("\n");//Move to the next line for print
}

}
}

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

Floyd’s triangle star pattern 3

Program 3

import java.util.Scanner;//import the scanner class 
class Triangle_While3{ 
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;
    i=1;
    while(i<=rows){
        j=1;
        while(j<=rows){
        
    if(j==i || j==rows ||i==1 )
        System.out.print("*");
    else
        System.out.print(" ");
    j++;;
        }
        i++;
System.out.print("\n");//Move to the next line for print
}

}
}

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

Floyd’s triangle star pattern 4

Program 4

import java.util.Scanner;//import the scanner class 
class Triangle_While4{ 
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;
    i=1;
    while(i<=rows){
        j=i;
        while(j<=rows){
        
    if( i==1|| j==i || j==rows)
        System.out.print("*");
    else
        System.out.print(" ");
    j++;;
        }
        i++;
System.out.print("\n");//Move to the next line for print
}

}
}

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

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