单例模式序列化后反序列化单例失效的问题

public class User implements Serializable {
    
    public String getName() {
        return name;
    }

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

    public  static final User INSTANCE= new User();
    private String  name ;
    
//    private  Object readResolve(){
//        return INSTANCE;
//    }
    
    public User() {
    }

}

public class Test {
    
    public static void main(String [] arg) throws IOException, ClassNotFoundException{
        User user = (User) User.INSTANCE;
        
//        System.out.println("user:cxx");
//        user.setName("cxx");
//        
//        new Thread(new  Runnable() {
//            public void run() {
//                System.out.println("user1:"+User.INSTANCE.getName());
//            }
//        }).start();
//        User user1= User.INSTANCE;
//        System.out.println("user1:"+user1.getName());
        
        try {
            FileOutputStream fos = new FileOutputStream(new File("singToneTest.txt"));
            ObjectOutputStream oos = new ObjectOutputStream(fos);
            oos.writeObject(user);
            fos.close();
            oos.close();
            System.out.println("user"+user.INSTANCE.hashCode());
            
            FileInputStream fis= new FileInputStream(new File("singToneTest.txt"));
            ObjectInputStream ois = new ObjectInputStream(fis);
            User newuser = (User) ois.readObject();
            fis.close();
            ois.close();
            System.out.println("newuser"+newuser.hashCode());
            
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }
}

 readObject--->readObject0--->readOrdinaryObject--->checkResolve

private Object readOrdinaryObject(boolean unshared)
        throws IOException
    {
        //此处省略部分代码

        Object obj;
        try {
            obj = desc.isInstantiable() ? desc.newInstance() : null;
        } catch (Exception ex) {
            throw (IOException) new InvalidClassException(
                desc.forClass().getName(),
                "unable to create instance").initCause(ex);
        }

        //此处省略部分代码

        if (obj != null &&
            handles.lookupException(passHandle) == null &&
            desc.hasReadResolveMethod())
        {
            Object rep = desc.invokeReadResolve(obj);
            if (unshared && rep.getClass().isArray()) {
                rep = cloneArray(rep);
            }
            if (rep != obj) {
                handles.setObject(passHandle, obj = rep);
            }
        }

        return obj;
    }