Palindrome Checker Program in Java

This program checks if a given number is a palindrome. A palindrome is a number that remains the same when its digits are reversed.

Program Structure

The program is structured into the following parts:

• Class Definition: The class PalindromeChecker contains the main method and a helper method.
• Main Method: The main method reads input from the user and calls the helper method to check if the number is a palindrome.
• Helper Method: The isPalindrome method checks if the given number is a palindrome.

Java Code

/**
 * This class contains a method to check if a given number is a palindrome.
 */
public class PalindromeChecker {

    /**
     * Main method to execute the palindrome check.
     * @param args Command-line arguments (not used).
     */
    public static void main(String[] args) {
        java.util.Scanner scanner = new java.util.Scanner(System.in);
        System.out.println("Enter a number to check if it is a palindrome: ");
        int number = scanner.nextInt();
        scanner.close();

        if (isPalindrome(number)) {
            System.out.println(number + " is a palindrome.");
        } else {
            System.out.println(number + " is not a palindrome.");
        }
    }

    /**
     * Method to check if a given number is a palindrome.
     * @param number The number to check.
     * @return true if the number is a palindrome, false otherwise.
     */
    public static boolean isPalindrome(int number) {
        int originalNumber = number;
        int reversedNumber = 0;

        // Reverse the digits of the number
        while (number != 0) {
            int digit = number % 10;
            reversedNumber = reversedNumber * 10 + digit;
            number /= 10;
        }

        // Check if the original number is equal to the reversed number
        return originalNumber == reversedNumber;
    }
}

Explanation

The PalindromeChecker class includes a main method and a isPalindrome method.

• The main method starts by creating a Scanner object to read user input. It prompts the user to enter a number and stores the input in the variable number.
• The isPalindrome method is then called with the user-provided number. If the method returns true, the number is a palindrome; otherwise, it is not.
• The isPalindrome method works by reversing the digits of the given number and comparing the reversed number to the original number. If they are the same, the number is a palindrome.