Java Program to Print Alphabet R Pattern

In this Java pattern program, we show the steps to print the stars in an Alphabet R shape or pattern using for loop, while loop, and functions.

import java.util.Scanner;

public class Example 
{
	private static Scanner sc;
	
	public static void main(String[] args) 
	{
		sc = new Scanner(System.in);
		
		System.out.print("Enter Rows = ");
		int rows = sc.nextInt();

		for (int i = 0; i < rows; i++) 
		{
			for (int j = 0; j <= rows; j++) 
			{
				if ((i == 0 || i == rows / 2) && (0 < j && j < rows - 1)) 
				{
					System.out.printf("* ");
				} 
				else if ((i != 0) && (j == 0 || (j == rows - 1 && i < rows / 2 ))) 
				{
					System.out.printf("* ");
				} 
				else if(j == i && i >= rows / 2) 
				{
					System.out.printf("* ");
				} 
				else 
				{
					System.out.printf("  ");
				}
			}
			System.out.println();
		}
	}
}

Enter Rows = 14
  * * * * * * * * * * * *     
*                         *   
*                         *   
*                         *   
*                         *   
*                         *   
*                         *   
* * * * * * * * * * * * *     
*               *             
*                 *           
*                   *         
*                     *       
*                       *     
*                         *   

Within this Alphabet R shape or Pattern program, we replaced the for loop with a while loop to print the stars at each position. For more Alphabet Patterns and star pattern programs, please use the hyperlinks.

import java.util.Scanner;

public class Example 
{
	private static Scanner sc;
	
	public static void main(String[] args) 
	{
		sc = new Scanner(System.in);
		int rows, i, j;
		
		System.out.print("Enter Rows = ");
		rows = sc.nextInt();

		i = 0;
		while ( i < rows) 
		{
			j = 0;
			while ( j < rows) 
			{
				if ((i == 0) && (0 < j && j < rows - 1)) 
				{
					System.out.printf("* ");
				} 
				else if (i != 0 && j == 0) 
				{
					System.out.printf("* ");
				} 
				else if (i == rows / 2 && j != rows - 1) 
				{
					System.out.printf("* ");
				} 
				else if (i != 0 && j == rows - 1 && i < rows / 2) 
				{ 
					System.out.printf("* ");
				}		
				else if (j == i && i >= rows / 2)
				{
					System.out.printf("* ");
				}
				else 
				{
					System.out.printf("  ");
				}
				j++;
			}
			System.out.println();
			i++;
		}
	}
}

Enter Rows = 15
  * * * * * * * * * * * * *   
*                           * 
*                           * 
*                           * 
*                           * 
*                           * 
*                           * 
* * * * * * * * * * * * * *   
*               *             
*                 *           
*                   *         
*                     *       
*                       *     
*                         *   
*                           * 

In this program, we created an AlphabetRShape function to print the Alphabet R Pattern or shape filled with stars on rows and columns.

import java.util.Scanner;

public class Example 
{
	private static Scanner sc;
	
	public static void main(String[] args) 
	{
		sc = new Scanner(System.in);
		
		System.out.print("Enter Rows = ");
		int rows = sc.nextInt();

		System.out.print("Enter Character = ");
		char a = sc.next().charAt(0);

		AlphabetRShape(rows, a);
	}
	
	public static void AlphabetRShape(int rows, char a) 
	{
		for (int i = 0; i < rows; i++) 
		{
			for (int j = 0; j <= rows; j++) 
			{
				if ((i == 0 || i == rows / 2) && (0 < j && j < rows - 1)) 
				{
					System.out.printf("%c", a);
				} 
				else if ((i != 0) && (j == 0 || (j == rows - 1 && i < rows / 2 ))) 
				{
					System.out.printf("%c", a);
				} 
				else if(j == i && i >= rows / 2) 
				{
					System.out.printf("%c", a);
				} 
				else 
				{
					System.out.printf(" ");
				}
			}
			System.out.println();
		}
	}
}