Palindrome

import java.util.*;
public class Palindrome
{
public static void main(String[] args)
{
String deLimiters = ";:'<>,./?-+!@#$%^&*() ";
Stack stack = new Stack();
Scanner reader = new Scanner(System.in);

while(true)
{
String palindrome = "";
String backwards = "";

System.out.println("Please enter a palindrome (Type n to quit): ");
String str = reader.nextLine();

if(str.equalsIgnoreCase("n"))
{
System.exit(0);
}
StringTokenizer tokens = new StringTokenizer(str, deLimiters);
StringTokenizer tokens2 = new StringTokenizer(palindrome, deLimiters);



while(tokens.hasMoreTokens())
{
palindrome += tokens.nextToken();
}
for(int i = 0; i < palindrome.length(); i++)
{
stack.add(palindrome.substring(i, i +1));
}

while(! stack.empty())
{
backwards += stack.pop();
}
if(palindrome.equalsIgnoreCase(backwards))
{
System.out.println("Your phrase: " + palindrome + " is a Palindrome");
}
else
{
System.out.println("Your phrase: " + palindrome + " is not a Palindrome");
}
}

}

}

OUTPUT
--------------------Configuration: --------------------
Please enter a palindrome (Type n to quit):
SAYA
Your phrase: SAYA is not a Palindrome
Please enter a palindrome (Type n to quit):
KAKAK
Your phrase: KAKAK is a Palindrome
Please enter a palindrome (Type n to quit):
N

Process completed.