wap to read given no is pallindrome or not

import java.util.Scanner;

 

class Palindrome

{

   public static void main(String args[])

   {

      String str, rev = "";

      Scanner sc = new Scanner(System.in);

 

      System.out.println("Enter a string:");

      str = sc.nextLine();

 

      int length = str.length();

 

      for ( int i = length - 1; i >= 0; i-- )

         rev = rev + str.charAt(i);

 

      if (str.equals(rev))

         System.out.println(str+" is a palindrome");

      else

         System.out.println(str+" is not a palindrome");

 

   }

}