Palindrome Program in Java

• String palindrome: 'MADAM' reversed = 'MADAM' (same) → Palindrome
• Number palindrome: 121 reversed = 121 (same) → Palindrome
• Not palindrome: 'HELLO' reversed = 'OLLEH' (different)

import java.util.Scanner;
public class PalindromeString {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter a string: ");
        String str = sc.nextLine();
        String rev = "";
        
        for (int i = str.length() - 1; i >= 0; i--) {
            rev = rev + str.charAt(i);
        }
        
        if (str.equalsIgnoreCase(rev)) {
            System.out.println(str + " is a Palindrome");
        } else {
            System.out.println(str + " is NOT a Palindrome");
        }
    }
}

Output: Enter a string: MADAM → MADAM is a Palindrome

import java.util.Scanner;
public class PalindromeNumber {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter a number: ");
        int n = sc.nextInt();
        int original = n, rev = 0, rem;
        
        while (n != 0) {
            rem = n % 10;
            rev = rev * 10 + rem;
            n = n / 10;
        }
        
        if (original == rev) {
            System.out.println(original + " is a Palindrome");
        } else {
            System.out.println(original + " is NOT a Palindrome");
        }
    }
}

Output: Enter a number: 121 → 121 is a Palindrome