Java Program to Determine if a Number is Odd or Even

This Java program checks whether a given number is odd or even. Below is the complete code with an explanation of each part of the program structure and documentation.

Program Code

// Importing the Scanner class for user input
import java.util.Scanner;

/**
 * This class contains a method to determine if a number is odd or even.
 */
public class OddEvenChecker {

    /**
     * The main method is the entry point of the program.
     * @param args Command line arguments (not used in this program)
     */
    public static void main(String[] args) {
        // Create a Scanner object to read input from the user
        Scanner scanner = new Scanner(System.in);

        // Prompt the user to enter a number
        System.out.println("Enter a number: ");
        int number = scanner.nextInt();

        // Check if the number is odd or even and display the result
        if (isEven(number)) {
            System.out.println(number + " is an even number.");
        } else {
            System.out.println(number + " is an odd number.");
        }

        // Close the scanner object to prevent resource leak
        scanner.close();
    }

    /**
     * This method checks if a given number is even.
     * @param num The number to be checked
     * @return true if the number is even, false otherwise
     */
    public static boolean isEven(int num) {
        // A number is even if it is divisible by 2
        return num % 2 == 0;
    }
}

Explanation of the Program

Let’s break down the program into its main components:

• Importing the Scanner class: We import java.util.Scanner to use the Scanner class for reading input from the user.
• Class Definition: The OddEvenChecker class contains the main method and a helper method isEven.
• Main Method: The main method is the entry point of the program. It prompts the user to enter a number, reads the input, checks if the number is even or odd using the isEven method, and then displays the result.
• isEven Method: This method takes an integer as a parameter and returns true if the number is even (i.e., divisible by 2) and false otherwise.
• Closing the Scanner: We close the Scanner object after using it to prevent resource leaks.