In this article, we will discuss the concept of Program to Print Hollow rectangle or square star pattern in Java programming language
In this post, we are going to learn How to write a Java program to print Hollow rectangle or square star pattern using for loop, while loop and Do-while loops with example programs
Program 1
This program allows the user to enter the number of rows and columns and then it will display Hollow rectangle and square pattern using for loop in Java language
import java.util.Scanner; class Hollow_RectanglePat{ public static void main(String args[]){ int rows,columns;//declare variable size Scanner scan=new Scanner(System.in); //create a scanner object for input System.out.print("Enter the nunber of rows: "); rows=scan.nextInt(); //get input from the user for row System.out.print("Enter the nunber of rows: "); columns=scan.nextInt(); //get input from the user for coloum for (int i=1; i<=rows; i++){ for (int j=1; j<=columns; j++){ if(i==1||i==rows||j==1||j==columns){ System.out.print("*"); }else{ System.out.print(" "); } } System.out.print("\n"); } } }
When the above code is executed, it produces the following results
Program 2
This program allows the user to enter the number of rows and columns and then it will display Hollow rectangle and square pattern using while loop in Java language
import java.util.Scanner; class Hollow_RectanglePat1{ public static void main(String args[]){ int rows,columns;//declare variable size Scanner scan=new Scanner(System.in); //create a scanner object for input System.out.print("Enter the nunber of rows: "); rows=scan.nextInt(); //get input from the user for row System.out.print("Enter the nunber of rows: "); columns=scan.nextInt(); //get input from the user for coloum int i=1; while( i<=rows){ int j=1; while( j<=columns){ if(i==1||i==rows||j==1||j==columns){ System.out.print("*"); }else{ System.out.print(" "); } j++; } System.out.print("\n"); i++; } } }
When the above code is executed, it produces the following results
Program 3
This program allows the user to enter the number of rows and columns and then it will display Hollow rectangle and square pattern using the do-while loop in Java language
import java.util.Scanner; class Hollow_RectanglePat2{ public static void main(String args[]){ int rows,columns;//declare variable size Scanner scan=new Scanner(System.in); //create a scanner object for input System.out.print("Enter the nunber of rows: "); rows=scan.nextInt(); //get input from the user for row System.out.print("Enter the nunber of rows: "); columns=scan.nextInt(); //get input from the user for coloum int i=1; do{ int j=1; do{ if(i==1||i==rows||j==1||j==columns){ System.out.print("*"); }else{ System.out.print(" "); } j++; }while( j<=columns); System.out.print("\n"); i++; }while( i<=rows); } }
When the above code is executed, it produces the following results
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