Check if a given string or number is a Palindrome.

Q: Write a Java program to check whether a given string or number is a palindrome or not.?

A palindrome is a word, number, or sequence that reads the same backward as forward.

Examples:

• “madam” → Palindrome

• “racecar” → Palindrome

• “hello” → Not a Palindrome

• 121 → Palindrome

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✅ Java Program: Palindrome Check

import java.util.Scanner;

public class PalindromeCheck {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter a string or number: ");
        String input = sc.nextLine();
        
        // Convert to lowercase to make it case-insensitive
        input = input.toLowerCase();
        
        // Reverse the input
        String reversed = new StringBuilder(input).reverse().toString();
        
        // Compare original and reversed
        if (input.equals(reversed)) {
            System.out.println("✅ The given input is a Palindrome.");
        } else {
            System.out.println("❌ The given input is NOT a Palindrome.");
        }
        
        sc.close();
    }
}

🔍 Explanation

1. Input – Takes a string or number from the user.

2. Reverse – Uses StringBuilder.reverse() to reverse the string.
   

3. Compare – Checks if the original and reversed strings are equal.

4. Output – Prints whether it’s a palindrome or not.