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home / developersection / forums / write a java program to check whether a string is a palindrome.
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Ashutosh Patel
Ashutosh Patel

Jr. Software Developer

I am a software developer at MindStick soft. Pvt. ltd. I joined this company in august 2021 after completing my post-graduation course. I love to see the historical places of my country.

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3 Answers

Aryan Kumar
Aryan Kumar 19 Apr 2023
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Chnaged Data

Gulshan Negi
Gulshan Negi 07 Apr 2023
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Hello this is Gulshan Negi

Well, here is the program that you should try.

import java.util.Scanner;
public class PalindromeChecker {
   public static void main(String[] args) {
       Scanner input = new Scanner(System.in);
       System.out.print("Enter a string: ");
       String str = input.nextLine();
       if(isPalindrome(str)) {
           System.out.println(str + " is a palindrome");
       } else {
           System.out.println(str + " is not a palindrome");
       }
   }
   public static boolean isPalindrome(String str) {
       String reverseStr = new StringBuilder(str).reverse().toString();
       return str.equalsIgnoreCase(reverseStr);
   }
}


I hope it will help you.

Thanks      

Krishnapriya Rajeev
Krishnapriya Rajeev 23 Mar 2023
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Given below is a code to check whether a given string is palindrome or not.

class palindrome
{
    public static void main(String args[])
    {
        String word = "Malayalam";

        int flag=1;
        int n = word.length();
        String rev = "";
        for(int i = n-1; i >= 0; i--)
        {
        	//reversing the string
        	rev += word.charAt(i);
        }

        for(int i = 0; i < n; i++)
        {
            if(rev.charAt(i) != word.charAt(i))
            {
                //checking if reversed string and given string are equal
                if(rev.charAt(i) - word.charAt(i) == 32 || word.charAt(i) - rev.charAt(i)== 32)
                {
                    flag=1;
                }
                else
                {   
                	flag=0;
                	break;
                }
            }
        }

        if(flag==1)
        {
            System.out.println(word+" is a palindrome.");
        }
         else
            System.out.println(word+" is not a palindrome.");
    }
}
OUTPUT:
Malayalam is a palindrome.

Here, we reverse the given string and store it in another string object. Then, we check each letter of both the given string and reversed string. If the characters are not the same at any point, we set flag = 0 and breaks from the loop.

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