java EOFException因为复制或重命名文件

Question

这是关于java序列化的问题。 首先，我粘贴我的代码。

import java.io.*;

public class Admin implements Serializable{
    private static final long serialVersionUID = 613659699548582156L;
    private String user;
    private String password;

    @Override
    public String toString() {
        return "{class:'Admin'" +
                ", user:'" + user + '\'' +
                ", password:'" + password + '\'' +
                '}';
    }

    public Admin(String user, String password) {
        this.user = user;
        this.password = password;
    }

    public Admin() {

    }

    public String getUser() {

        return user;
    }

    public void setUser(String user) {
        this.user = user;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }


    public boolean equals(Object o){
        if (o == null) {
            return false;
        }
        if (this == o) {
            return true;
        }
        Admin admin = (Admin) o;
        return  (user != null ? user.equals(admin.getUser()) : admin.getUser() == null) &&
                (password != null ? password.equals(admin.getPassword()) : admin.getPassword() == null);
    }

    public static void main(String[] args) {
        //write object
//        try {
//            ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(Admin.class.getClassLoader().getResource("admin.out").getPath()));
//            Admin a = new Admin("longlongago", "longlongago");
//            out.writeObject(a);
//            out.flush();
//            out.close();
//        } catch (IOException e) {
//            e.printStackTrace();
//        }

        //read object
        try {
            ObjectInputStream in = new ObjectInputStream(Admin.class.getClassLoader().getResourceAsStream("admin.out"));
            Admin a = (Admin) in.readObject();
            System.out.println(a.toString());
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}

java.io.EOFException
        at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2353)
        at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:2822)
        at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:804)
        at java.io.ObjectInputStream.<init>(ObjectInputStream.java:301)
        at pw.loveyouforever.Model.Admin.main(Admin.java:68)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)

当我复制或重命名文件时，它会显示为java.io.EOFException。 即使我将文件名更改为以前的名称，它仍会显示java.io.EOFException。只更改了文件名，文件的数据不会发生变化。为什么我不能读取此文件中的对象？