java code adt

ลำดับตอนที่ #2 : palin

import java.util.Scanner;
import java.util.Stack;
import sun.misc.Queue;

 
public class Palindrome{
 public static boolean test(String candidate){
  char a;
  int length;
  int numDigits;
  int charCount;
 
  boolean stillPalindrome;
  char fromStack;
  char fromQueue = 0;
  
  Stack<Character> stack = new Stack<Character>();
  Queue queue = new Queue();
  length = candidate.length();
  numDigits = 0;

  for(int i = 0 ;i<length;i++){
   a = candidate.charAt(i);
   if(Character.isDigit(a)){
    numDigits++;
    stack.push(a);
    queue.enqueue(a);
   }
  }
  stillPalindrome = true;
  charCount = 0;
  while(stillPalindrome && (charCount<numDigits)){
   fromStack = (Character)stack.peek();
   stack.pop();
   try {
    fromQueue = (Character)queue.dequeue();
   } catch (InterruptedException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
   if(fromStack != fromQueue)
    stillPalindrome = false;
   charCount++;
   }
  return stillPalindrome ;
 }

 public static void main(String[] args){
  Scanner fill = new Scanner(System.in);
  String candidate = null;
  String more = null;
  
  do{
   System.out.println("Enter a years to be evaluated:  ");
   candidate = fill.nextLine();
   if(Palindrome.test(candidate))
    System.out.println("is a palindrome");
   else
    System.out.println("is not a palindrome");
   System.out.println();
   System.out.print("Evaluate another string? (Y = Yes): ");
   more = fill.nextLine();
   System.out.println();
  }
  while(more.equalsIgnoreCase("y"));
  }
 }