I wrote a palindrome using stacks in java. But, due to some reason while popping the stack the program is not working as expected. I have also tried using the top and iterate using this variable. Either ways it is not working.

```
import java.util.Stack;

class Palindromer {

Stack<Character> stack = null;
int top = -1;

public boolean isPalindrome(String s) {
    for (int i = 0; i < s.length(); i++) {
        stack = new Stack<Character>();
        stack.push(s.charAt(i));
        top++;
    }

    System.out.println("value of top is " + top);
    String returnString = "";

    while (!stack.isEmpty()) {
        returnString += stack.pop();
    }
    System.out.println(returnString);

    return returnString.equals(s);
}
}

public class PalindromeChecker {
public static void main(String[] args) {
    Palindromer palin = new Palindromer();
    if (palin.isPalindrome("BananaB")) {
        System.out.println("is palindrome");
    } else {
        System.out.println("not a palindrome");
    }
}
}

```