出现EOFException错误，按视频中的是顺序错误我没办法理解我这个代码顺序哪里出错了

package com.imooc.print.classfile;

import java.io.*;

public class Test {
    public static void main(String[] args) {
        Product p1 = new Product("123", "iphone", "telephone", 4888.0);
        Product p2 = new Product("234", "ipad", "computer", 5088.0);
        Product p3 = new Product("345", "macbook", "computer", 10688.0);
        Product p4 = new Product("256", "iwatch", "watch", 4799.0);
        try {
            FileOutputStream fos = new FileOutputStream("apple.txt");
            BufferedOutputStream bos = new BufferedOutputStream(fos);
            ObjectOutputStream oos = new ObjectOutputStream(bos);
            FileInputStream fis = new FileInputStream("apple.txt");
            BufferedInputStream bis = new BufferedInputStream(fis);
            ObjectInputStream ois = new ObjectInputStream(bis);
            oos.writeObject(p1);
            oos.writeObject(p2);
            oos.writeObject(p3);
            oos.writeObject(p4);
            oos.flush();
            System.out.println((Product) ois.readObject());
            System.out.println((Product) ois.readObject());
            System.out.println((Product) ois.readObject());
            System.out.println((Product) ois.readObject());

            fos.close();
            bos.close();
            oos.close();
            fis.close();
            bis.close();
            ois.close();

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
}