Java Program to Print Hollow Box Number Pattern

In this article, we will show you, How to write a Java Program to Print Hollow Box Number Pattern using For Loop, and While Loop with example.

Java Program to Print Hollow Box Number Pattern using For Loop

This program allows the user to enter number of rows, and column values. Next, it will print Hollow Box number pattern of 1’s. I mean, it will print First row, last row, first column, and last column as 1’s, and the remaining elements as Empty.

// Java Program to Print Hollow Box Number Pattern
import java.util.Scanner;

public class HollowBoxNumber1 {
	private static Scanner sc;
	public static void main(String[] args) 
	{
		int rows, columns, i, j;
		sc = new Scanner(System.in);
		
		System.out.print(" Please Enter Number of Rows : ");
		rows = sc.nextInt();	
		
		System.out.print(" Please Enter Number of Columns : ");
		columns = sc.nextInt();	
		
		for(i = 1; i <= rows; i++)
		{
			for(j = 1; j <= columns; j++)
			{
				if(i == 1 || i == rows || j == 1 || j == columns)
				{
					System.out.print("1"); 
				}
				else
				{
					System.out.print(" "); 
				}
			}
			System.out.print("\n"); 
		}	
	}
}

OUTPUT

ANALYSIS

First For loop is to iterate from 1 to total number of rows. Next, we used Nested For Loop to iterate j from 1 to total number of columns

User entered value: rows  = 7, and columns = 9

First For Loop – First Iteration: for(i = 1; i <= 7; i++)
Condition is True. So, it will enter into second For Loop

Second For Loop – First Iteration: for(j = 1; 1 <= 9; 1++)
Condition is True. So, it will check the condition inside the If statement
if(i == 1 || i == rows || j == 1 || j == columns)
=> if(1 == 1 || 1 == 7 || 1 == 1 || 1 == 9) – Condition is True so, it will print 1

Repeat the same for remaining iteration.

Java Program to Print Hollow Box Number Pattern using While Loop

This program is same as above example but this time we are using the While Loop.

// Java Program to Print Hollow Box Number Pattern
import java.util.Scanner;

public class HollowBoxNumber2 {
	private static Scanner sc;
	public static void main(String[] args) 
	{
		int rows, columns, i = 1, j;
		sc = new Scanner(System.in);
		
		System.out.print(" Please Enter Number of Rows : ");
		rows = sc.nextInt();	
		
		System.out.print(" Please Enter Number of Columns : ");
		columns = sc.nextInt();	
		
		while(i <= rows)
		{
			j = 1;
			while(j <= columns)
			{
				if(i == 1 || i == rows || j == 1 || j == columns)
				{
					System.out.print("1"); 
				}
				else
				{
					System.out.print(" "); 
				}
				j++;
			}
			i++;
			System.out.print("\n"); 
		}	
	}
}

OUTPUT

Java Program to Print Hollow Box Number Pattern Example 3

This program is same as first example but it will print first row, last row, first column, and last column as 0’s, and the remaining elements as empty space.

// Java Program to Print Hollow Box Number Pattern
import java.util.Scanner;

public class HollowBoxNumber3 {
	private static Scanner sc;
	public static void main(String[] args) 
	{
		int rows, columns, i, j;
		sc = new Scanner(System.in);
		
		System.out.print(" Please Enter Number of Rows : ");
		rows = sc.nextInt();	
		
		System.out.print(" Please Enter Number of Columns : ");
		columns = sc.nextInt();	
		
		for(i = 1; i <= rows; i++)
		{
			for(j = 1; j <= columns; j++)
			{
				if(i == 1 || i == rows || j == 1 || j == columns)
				{
					System.out.print("0"); 
				}
				else
				{
					System.out.print(" "); 
				}
			}
			System.out.print("\n"); 
		}	
	}
}

OUTPUT

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