請問大大為什麼會出現RE呢 ? ~"~ 程式碼 謝謝

import java.util.Scanner;

public class test {

  public static void main(String[]args) {

    Scanner input = new Scanner(System.in);

while (true) {

 String text = input.next();

 char[] x = text.toCharArray();

 char[] y = new char[1000];

 boolean sure = true;

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

   y[x.length-1-i] = x[i];

 }

 for ( int i = 0 ; i < x.length ; i++ ) {

   if ( x[i] != y[i] ) {

 sure = false;

 break;

}

 }

 System.out.println(sure? "yes" : "no");

}

  }

}