反序列化读取多个对象时强转报错是为什么

报错信息:

存储对象:

package IoSuper;

import java.io.*;
import java.util.ArrayList;
import java.util.Collections;

public class ObjectStreamDemo3 {
    public static void main(String[] args) throws IOException, ClassNotFoundException {
        ObjectOutputStream ob=new ObjectOutputStream(new FileOutputStream("D:\\JAVA\\HeiMa\\c\\objectStream.txt"));
        Student s1=new Student("zs",23);
        Student s2=new Student("ls",23);
        Student s3=new Student("ws",23);
        ArrayList<Student> list=new ArrayList<>();
        Collections.addAll(list,s1,s2,s3);
        for (Student student : list) {
            ob.writeObject(student);
        }
        ob.close();

    }
}

读取对象:

package IoSuper;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.util.ArrayList;

public class ObjectStreamDemo4 {
    public static void main(String[] args) throws IOException, ClassNotFoundException {
        ObjectInputStream ois=new ObjectInputStream(new FileInputStream("D:\\JAVA\\HeiMa\\c\\objectStream.txt"));
       ArrayList<Student> list1 = (ArrayList<Student>) ois.readObject();
        for (Student student : list1) {
            System.out.println(student.getName()+" "+student.getAge());
        }
        ois.close();
    }
}

JavaBean:

package IoSuper;

import java.io.Serializable;

public class Student implements Serializable {
    private static final long serialVersionUID = 393646513909202246L;
    private String name;
    private int age;

    public Student(){}
    public Student(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

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