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Write a java program to check whether a string is a palindrome.

Ashutosh Patel 134 22-Mar-2023

Write a java program to check whether a string is a palindrome.

java java  programs 
Updated on 19-Apr-2023
Ashutosh Patel

Ashutosh Patel

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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

Chnaged Data

Gulshan Negi

Gulshan Negi

07-Apr-2023

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

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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