Java Pyramid Pattern Program

This blog post shows how to write a Java program to print the Pyramid pattern of stars, numbers, and alphabets with an example of each. It also covers the hollow, inverted, and inverted hollow pyramid patterns with the best approach.

Although this article shows the best possible way to print the various kinds of pyramid patterns, we haven’t mentioned the code analysis. Because there is a dedicated article for each sub-section, and we provide a hyperlink to it. Please click the link to find an alternative approach and the code explanation.

Java Program to Print Pyramid Pattern of Stars

This program accepts the user-inserted rows. Next, we used the nested for loop to iterate the rows and columns and print the pyramid pattern. Please refer to this article to understand the code.

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("Please Enter Rows = ");
		int rw = sc.nextInt();

		for (int i = 1; i <= rw; i++) {
			for (int j = 0; j < rw - i; j++) {
				System.out.print(" ");
			}
			for (int k = 0; k < (i * 2) - 1; k++) {
				System.out.print("*");
			}
			System.out.println();
		}
	}
}

Hollow Pyramid Star Pattern

For more information on hollow example >> Click Here.

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 rw = sc.nextInt();
		int i, j, k;

		for (i = 1; i <= rw; i++) {
			for (j = 1; j <= rw - i; j++) {
				System.out.print(" ");
			}
			if (i == 1 || i == rw) {
				for (k = 1; k <= (i * 2) - 1; k++) {
					System.out.print("*");
				}
			} else {
				for (k = 1; k <= (i * 2) - 1; k++) {
					if (k == 1 || k == i * 2 - 1) {
						System.out.print("*");
					} else {
						System.out.print(" ");
					}
				}
			}
			System.out.println();
		}
	}
}

Output

Enter Rows = 12
           *
          * *
         *   *
        *     *
       *       *
      *         *
     *           *
    *             *
   *               *
  *                 *
 *                   *
***********************

Inverted Pyramid Pattern of Stars

For more information on inverted >> Click Here.

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 rw = sc.nextInt();

		for (int i = rw; i >= 1; i--) 
		{
			for (int j = 0; j < rw - i; j++) 
			{
				System.out.print(" ");
			}
			for (int k = 0; k != (2 * i) - 1; k++) 
			{
				System.out.print("*");
			}
			System.out.println();
		}
	}
}

Output

Enter rows = 10
*******************
 *****************
  ***************
   *************
    ***********
     *********
      *******
       *****
        ***
         *

Hollow Inverted Pyramid of Stars

For more information on hollow inverted >> Click Here.

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 rw = sc.nextInt();

		for (int i = rw ; i > 0; i-- ) 
		{
			for (int j = 1 ; j <= rw - i; j++ ) 
			{
				System.out.print(" ");
			}
			for (int k = 1 ; k <= (2 * i) - 1; k++ ) 
			{
				if (i == 1 || i == rw || k == 1 || k == (2 * i) - 1)
				{
					System.out.print("*");
				}
				else
				{
					System.out.print(" ");
				}			
			}
			System.out.println();
		}
	}
}

Output

Enter Rows = 9
*****************
 *             *
  *           *
   *         *
    *       *
     *     *
      *   *
       * *
        *

Java Program to Print Pyramid Pattern of Numbers

The above-mentioned programs print the pyramid pattern of stars however, you can also use the numbers to fill the pattern. For more information >> Click Here.

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 rw = sc.nextInt();

		for (int i = 1; i <= rw; i++ ) 
		{
			for (int j = rw; j > i; j-- ) 
			{
				System.out.print(" ");
			}
			for(int k = 1; k <= i; k++) 
			{
				System.out.print(i + " ");
			}
			System.out.println();
		}
	}
}

Output

Enter Rows = 9
        1 
       2 2 
      3 3 3 
     4 4 4 4 
    5 5 5 5 5 
   6 6 6 6 6 6 
  7 7 7 7 7 7 7 
 8 8 8 8 8 8 8 8 
9 9 9 9 9 9 9 9 9 

Java Program to Print Pyramid Pattern of Alphabets

This example program prints the characters or alphabets to fill the pattern. For more information >> Click Here.

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 rw = sc.nextInt();

		int alp = 64;

		for (int i = 1; i <= rw; i++) 
		{
			for (int j = 1; j <= rw - i; j++) 
			{
				System.out.print(" ");
			}
			for (int k = i; k > 0; k--) 
			{
				System.out.print((char) (alp + k));
			}
			for (int l = 2; l <= i; l++) 
			{
				System.out.print((char) (alp + l));
			}
			System.out.println();
		}
	}
}

Output

Enter Rows = 14
             A
            BAB
           CBABC
          DCBABCD
         EDCBABCDE
        FEDCBABCDEF
       GFEDCBABCDEFG
      HGFEDCBABCDEFGH
     IHGFEDCBABCDEFGHI
    JIHGFEDCBABCDEFGHIJ
   KJIHGFEDCBABCDEFGHIJK
  LKJIHGFEDCBABCDEFGHIJKL
 MLKJIHGFEDCBABCDEFGHIJKLM
NMLKJIHGFEDCBABCDEFGHIJKLMN