Palindrome String in Java - Simple Java Interview Program

Palindrome String in Java

A palindrome is a string that reads the same forward and backward. In this post, you'll learn how to write a Java program to check if a string is a palindrome.

What is a Palindrome?

Examples of palindrome strings include:

• madam
• racecar
• level
• radar

Java Program to Check Palindrome

import java.util.Scanner;

public class PalindromeCheck {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter a string: ");
        String input = scanner.nextLine();

        String reversed = new StringBuilder(input).reverse().toString();

        if (input.equalsIgnoreCase(reversed)) {
            System.out.println(input + " is a palindrome.");
        } else {
            System.out.println(input + " is not a palindrome.");
        }
    }
}

Output

Enter a string: radar  
radar is a palindrome.

Explanation

• We use StringBuilder to reverse the string.
• Then we compare the original and reversed string using equalsIgnoreCase.
• If both match, it’s a palindrome.

Conclusion

This simple Java program demonstrates how to check for palindromes — a common interview question and a great exercise in working with strings.