JAVA Program for Hollow Square Star Pattern

May 9, 2020

Printing Hollow Square Star Pattern

In this program we’re going to code a java program for hollow square star pattern program. A hollow square star pattern is one with star only on its boundaries and free space on all other places.
Take a input from user, for determining the number of rows and columns, and store it in the variable named as row and col, respectively and then write a “for loop” starting from i=1 to i<=row and then take another for loop to start from j=1 to j<=col and then we’ll use a  if statement “if(i==1 or i==col) or (j==1 or j==col)” for printing the stars on the desired places.

Hollow Square Star Pattern

Algorithm:

  • Take number of rows input from the user and store it in any variable (‘row’ in this case).
  • Take number of coloum input from the user and store it in any variable (‘col’ in this case).
  • Run  a loop ‘i’ number of times to iterate through all the rows. From i=1 to i<=row. The loop should be structured as for (int i = 1; i <=row; i++).
  • Run a nested loop inside the main loop for printing stars . From j=1 to j<=col. The loop should be structured as for (int j = 1; j <= col; j++).
  • Inside the above loop print stars only if  i==1 or i==col or j=1 or j=col in all other cases print a blank space.
  • Move to the next line by printing a new line. System.out.println();.

Code in Java:

import java.util.Scanner;
public class Pattern1 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		System.out.println("Enter row and col">);
		int row = sc.nextInt();
		int col = sc.nextInt();
		for (int i = 1; i <=row; i++) {
			for (int j = 1; j <= col; j++) 
				if((i==1 || i==col) || (j==1 || j==col))
					System.out.print("*");
				else
					System.out.print(" ");
			
			System.out.println();
			
		}
	}
}
This code is contributed by Shubham Nigam (Prepinsta Placement Cell Student)

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