Java/07-Java-Programs/054-Diamond-Pattern.java at main · shaikbasha-dev/Java · GitHub

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/*
 * ============================================================================
 * Program Name : Diamond Pattern
 * File Name    : 054-Diamond-Pattern.java
 * Class Name   : DiamondPattern
 *
 * Description:
 * This program accepts the number of rows from the user and prints
 * a Diamond Star Pattern using nested for loops.
 *
 * Objective:
 * - Understand user input using the Scanner class.
 * - Learn how to use nested for loops.
 * - Print a Diamond Star Pattern.
 *
 * Author      : Shaik Mahaboob Basha
 * Repository  : 01-Core-Java
 * Folder      : 08-Java-Programs
 * ============================================================================
 */

import java.util.Scanner;

public class DiamondPattern {

    // The main() method is the entry point of every Java application.
    public static void main(String[] args) {

        // Create a Scanner object to read input from the keyboard.
        Scanner scanner = new Scanner(System.in);

        // Ask the user to enter the number of rows.
        System.out.print("Enter the Number of Rows: ");

        // Read the number of rows entered by the user.
        int rows = scanner.nextInt();

        // Check whether the entered number of rows is valid.
        if (rows <= 0) {

            // Display an error message.
            System.out.println("Please enter a positive integer.");
            // Example Output:
            // Please enter a positive integer.

        } else {

            // Display the heading.
            System.out.println("Diamond Pattern:");

            // Print the upper half of the diamond.
            for (int i = 1; i <= rows; i++) {

                // Print the required leading spaces.
                for (int j = 1; j <= rows - i; j++) {

                    // Print two spaces for proper alignment.
                    System.out.print("  ");

                }

                // Print the stars for the current row.
                for (int k = 1; k <= (2 * i - 1); k++) {

                    // Print a star followed by a space.
                    System.out.print("* ");

                }

                // Move to the next line.
                System.out.println();

            }

            // Print the lower half of the diamond.
            for (int i = rows - 1; i >= 1; i--) {

                // Print the required leading spaces.
                for (int j = 1; j <= rows - i; j++) {

                    // Print two spaces for proper alignment.
                    System.out.print("  ");

                }

                // Print the stars for the current row.
                for (int k = 1; k <= (2 * i - 1); k++) {

                    // Print a star followed by a space.
                    System.out.print("* ");

                }

                // Move to the next line.
                System.out.println();

            }

            // Example Output:
            // Enter the Number of Rows: 5
            // Diamond Pattern:
            //         *
            //       * * *
            //     * * * * *
            //   * * * * * * *
            // * * * * * * * * *
            //   * * * * * * *
            //     * * * * *
            //       * * *
            //         *

        }

        // Close the Scanner object to release system resources.
        scanner.close();
    }
}