Java错误 [英] Java Error

问题描述

运行代码时出现错误.

我反序列化了其中没有几个对象的列表，并试图访问这些对象；

Hi,

I am getting an error while running my code,.

I deserialised a list with few objects in it and am trying to access these objects;

Iterator iterate = list.iterator();
    while(iterate.hasNext()) {
        Student student = (Student) iterate.next();
        if(a == (int)student.roll_no) {
            try {
                System.out.println("Re-enter your roll no. :  ");
                a = Integer.parseInt(br.readLine());
            }
            catch(Exception e) {
                e.printStackTrace();
            }
        }

但是它不能使用另一个int值来转换简单的int"rollno"字段；

我收到以下异常

But it is not able to cast the simple int "rollno" field with another int value;

I am getting the following Exception

Exception in thread "main" java.lang.ClassCastException: java.lang.Integer cannot be cast to com.Student

问候
Nakul Kundra

Regards
Nakul Kundra

推荐答案

错误是因为您试图将Integer强制转换为Student.
iterate包含Integer的列表，或者a被定义为Student.

The error is because you are trying to cast an Integer to a Student.
Either iterate contains a list of Integers or a is defined as a Student.

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