Example: Star Pyramid Pattern in Java

// Star Pyramid Pattern
import java.util.Scanner;

// Main class containing the entry point of the program
public class Main {
    public static void main(String[] args) {
        // Step 1: Initialize Scanner for user input
        Scanner scanner = new Scanner(System.in);

        // Step 2: Prompt user for the number of rows
        System.out.print("Enter the number of rows for the pyramid: ");
        int numRows = scanner.nextInt();

        // Step 3: Outer loop for iterating through each row
        for (int i = 1; i <= numRows; i++) {
            // Inner loop 1: Print leading spaces
            // The number of spaces decreases as the row number increases
            for (int j = 1; j <= numRows - i; j++) {
                System.out.print(" ");
            }

            // Inner loop 2: Print stars
            // The number of stars increases by 2 in each subsequent row (1, 3, 5, ...)
            for (int k = 1; k <= 2 * i - 1; k++) {
                System.out.print("*");
            }

            // Move to the next line after printing spaces and stars for the current row
            System.out.println();
        }

        // Step 4: Close the scanner
        scanner.close();
    }
}