Java Program to Print Alphabet M Pattern

In this Java pattern program, we show the steps to print the stars in an Alphabet M 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++) 
		{
			System.out.printf("*");
			
			for (int j = 0; j <= rows; j++) 
			{
				if ((j == rows) || (j == i && j < rows / 2)
						|| (j == rows - i - 1 && j > rows / 2)) 
				{
					System.out.printf("*");
				} 
				else 
				{
					System.out.printf(" ");
				}
			}
			System.out.println();
		}
	}
}

Enter Rows = 17
**               **
* *             * *
*  *           *  *
*   *         *   *
*    *       *    *
*     *     *     *
*      *   *      *
*       * *       *
*                 *
*                 *
*                 *
*                 *
*                 *
*                 *
*                 *
*                 *
*                 *

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

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

In this program, we created an AlphabetMShape function to print the Alphabet M 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);

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