问获取ClassCastException

EN

public class Test {
   public static void main(String[] args) {
      JSONParser parser = new JSONParser();
      ArrayList al = new ArrayList(); 

      try {
         Object jsonData = parser.parse(new FileReader("C:\\Users\\b\\Desktop\\test.json"));
         JSONObject jsonObject = (JSONObject) jsonData;

         JSONIteratorAuthor itr = new JSONIteratorAuthor(jsonObject);
         while(itr.hasNext()){
            al.add(itr.next());
         }

         while(itr.hasNext()){
             Object element = itr.next();
             System.out.print(element + "");
         }        
     } 
     catch (FileNotFoundException e) {
        e.printStackTrace();
     } 
     catch (IOException e) {
        e.printStackTrace();
     } 
     catch (ParseException e) {
        e.printStackTrace();
     }
  }
}