Palindrome_class

public class Palindrome_class 
{
// instance variable
char[] characterArray;

//constructor
//@param data is a string of characters
public Palindrome_class(String data)
{
    characterArray = data.toUpperCase().toCharArray();
}

//@return true if the word is a palindrome, otherwise returns false.
public boolean isPalindrome(char[] a, int used)
{
    int i = 0, j = used - 1;

    while (i < j)
    {
        if(characterArray[i] == characterArray[j])
        {
            i++;
            j--;
        }
        else
        {
            return false;
        }
    }
    return true;
  }
}

PalindromeTest

import java.util.Scanner;
public class PalindromeTest 
{ 
public static void main(String[] args) 
{ 
    int used = 0;
    char[] chars = new char[80];
    Scanner inputWord = new Scanner(System.in);
    Scanner reply = new Scanner(System.in);
    System.out.println("Enter a string characters, terminated by a period.");

    String data;
    String cq;
    Palindrome_class word;

    do
    {
    //input word from user.
        data = inputWord.nextLine();
        word = new Palindrome_class(data);

    //check for palindrome.
        if(word.isPalindrome(chars, used))
        System.out.println(data + " is a palindrome.");

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

    //request to continue or quit.
        System.out.println("Continue or Quit?");
        cq = reply.nextLine();
    }
    while (cq.equalsIgnoreCase("continue"));

    System.exit(0);
   }
}