Java program to Parallelogram star pattern using while loop

Java program to Parallelogram star pattern using while loop

In this article, we will discuss the concept of Java program to Parallelogram star pattern using while loop

In this post, we are going to learn how to write a program to print  parallelogram and Hollow parallelogram pattern using while loop in Java programming language.

 

Display parallelogram  star patterns Using while loop

Code to print Parallelogram star pattern

Program 1

This program allows the user  to enter the number of rows , columns and any symbols then it will display  the parallelogram    pattern using while loop in Java programming language

//program to print parallelogram star pattern
import java.util.Scanner;
public class parallelogramStar2{//class declaration
public static void main(String args[]){//main method

 Scanner scan=new Scanner(System.in); 
    //create a scanner object for input
    
System.out.println("Enter the number of rows: ");
//Takes input from the user to rows
int rows=scan.nextInt();
//Store the number of rows in rows variable-entered by user

System.out.println("Enter the number of columns: ");
//Takes input from the user to columns
int columns=scan.nextInt();
//Store the number of columns in the columns variable -entered by user

System.out.println("Enter Symbol as you wish: ");
//Ask input from the user as symbol
char ch=scan.next().charAt(0);
//Store the symbol in the ch variable entered by user

System.out.print("\n");//move to next line
int i=1;
while(i<=rows){//outer while loop 
int j=1; 
   while(j<=rows-i){//inner while loop
   System.out.print(" ");//print space
   j++;
   }
   j=1;
   while(j<=columns){//inner while loop
   System.out.print(ch);//print character after space
    j++;
}
 System.out.print("\n");//move to next line
  i++;
}
}
}

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

 

 

Code to print Hollow Parallelogram star pattern

Program 2

This program allows the user  to enter the number of rows , columns and any symbol then it will display  the Hollow parallelogram    pattern using while loop in Java programming language

//program to print Hollow parallelogram star pattern
import java.util.Scanner;
public class HollowparallelogramStar2{//class declaration
public static void main(String args[]){//main method

 Scanner scan=new Scanner(System.in); 
    //create a scanner object for input
    
System.out.println("Enter the number of rows: ");
//Ask input from the user to rows
int rows=scan.nextInt();
//Store the number of rows in rows variable-entered by user

System.out.println("Enter the number of columns: ");
//Ask input from the user to columns
int columns=scan.nextInt();
//Store the number of columns in columns variable-entered by user

System.out.println("Enter Symbol as you wish: ");
//Ask input from the user as symbol
char ch=scan.next().charAt(0);
//Store the symbol in the ch variable entered by user

System.out.print("\n");
int i=1; 
while(i<=rows){//outer while loop
int j=1;  
   while(j<=rows-i){//inner while loop
   System.out.print(" ");//print space
    j++;
   }
   j=1;
   while(j<=columns){//inner while loop
   if(i==1 || i==rows || j==1 || j==columns){
       //when the if statements is true
       //print symbol
       
   System.out.print(ch);//print symbol after space
   //when the if statements is false
       //move to else part
   }
   else{
         System.out.print(" ");//print space
   }
    j++;
}
 System.out.print("\n");//move to next line
  i++;
}
}
}

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

 

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