Project Solution: Generating an X Pattern in Java

Project Solution: Generating an X Pattern in Java

Java Source Code:

import java.util.Scanner;

public class XPattern {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n;

        // Prompt the user to enter the size of the X
        System.out.print("Enter the size of the X: ");
        n = scanner.nextInt();

        // Calculate the dimension of the square matrix
        int m = 2 * n - 1;

        // Loop through each row
        for (int i = 1; i <= m; i++) {
            // Loop through each column
            for (int j = 1; j <= m; j++) {
                // Print '*' if the current position is on either diagonal
                if (i == j || j == (m - i + 1)) {
                    System.out.print("*");
                } else {
                    // Print space otherwise
                    System.out.print(" ");
                }
            }
            // Move to the next line after each row
            System.out.println();
        }
    }
}

Explanation:

1. Input Handling:

   • The program starts by creating a Scanner object to read user input.
   • It prompts the user to enter the size of the X pattern (n).

2. Pattern Calculation:

   • The size of the square matrix (m) is calculated as 2 * n - 1.
   • Nested loops are used to iterate through each row and column of the matrix.

3. Pattern Generation:

   • The condition if (i == j || j == (m - i + 1)) checks if the current position is on one of the diagonals of the X.
   • If the condition is true, a star (*) is printed; otherwise, a space ( ) is printed.
   • After printing all columns for a row, the program moves to the next line.

4. Output:

   • The program prints the X pattern based on the user input.

Sample Output:

For an input of n = 3, the program produces the following output:

*   *
 * *
  *
 * *
*   *

Testing and Validation:

• Input Validation: Ensure the program correctly handles edge cases like n = 1 and large values of n.
• Sample Outputs: Run the program with various inputs and capture the outputs to include in your documentation.

Documentation:

• Comment each section of your code to explain its purpose.
• Write a brief report detailing how the program works, including screenshots of different test cases.

By following this structure, you will be able to create a comprehensive project that demonstrates your understanding of Java programming concepts, especially nested loops and conditional statements.