serialization in java

//the code display error when i can "readObject" method.
public class Person {

    private String city;


    public Person(String city) {
        this.city = city;
    }


    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }
}
import java.io.*;

public class Student extends Person implements Serializable {
    private int age;
     private String name;

    public Student( String name, String city,int age) {
        super(city);
        this.age = age;
        this.name = name;
    }
    @Serial
    private void writeObject(ObjectOutputStream oos) throws IOException {
        oos.defaultWriteObject();
        oos.writeUTF(this.getCity());
    }
    @Serial
    private void readObject(ObjectInputStream ois) throws IOException, ClassNotFoundException {
        ois.defaultReadObject();
        this.setCity(ois.readUTF());

    }

    public static void main(String[] args) {
        Student student= new Student("Boudaoud","mascara",20);
        try(FileOutputStream fos= new FileOutputStream("src/resources/test.ser");
            ObjectOutputStream oos= new ObjectOutputStream(fos))
        {
            oos.writeObject(student);
            System.out.println("Success");

        }catch (IOException ioe){
            ioe.printStackTrace();
            return;
        }

        try(FileInputStream fis= new FileInputStream("src/resources/test.ser");
            ObjectInputStream ois=new ObjectInputStream(fis)) {
            Student s=(Student) (ois.readObject());
            System.out.println("You wrote the student "+s.getName()+" his age :"+s.getAge()+" live in"+s.getCity());
        }catch (ClassNotFoundException | IOException e)
        {
            e.printStackTrace();
        }
    }
    public int getAge() {
        return age;
    }

    public String getName() {
        return name;
    }
}

//the code display error when i can "readObject" method.
public class Person {

    private String city;


    public Person(String city) {
        this.city = city;
    }


    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }
}
import java.io.*;

public class Student extends Person implements Serializable {
    private int age;
     private String name;

    public Student( String name, String city,int age) {
        super(city);
        this.age = age;
        this.name = name;
    }
    @Serial
    private void writeObject(ObjectOutputStream oos) throws IOException {
        oos.defaultWriteObject();
        oos.writeUTF(this.getCity());
    }
    @Serial
    private void readObject(ObjectInputStream ois) throws IOException, ClassNotFoundException {
        ois.defaultReadObject();
        this.setCity(ois.readUTF());

    }

    public static void main(String[] args) {
        Student student= new Student("Boudaoud","mascara",20);
        try(FileOutputStream fos= new FileOutputStream("src/resources/test.ser");
            ObjectOutputStream oos= new ObjectOutputStream(fos))
        {
            oos.writeObject(student);
            System.out.println("Success");

        }catch (IOException ioe){
            ioe.printStackTrace();
            return;
        }

        try(FileInputStream fis= new FileInputStream("src/resources/test.ser");
            ObjectInputStream ois=new ObjectInputStream(fis)) {
            Student s=(Student) (ois.readObject());
            System.out.println("You wrote the student "+s.getName()+" his age :"+s.getAge()+" live in"+s.getCity());
        }catch (ClassNotFoundException | IOException e)
        {
            e.printStackTrace();
        }
    }
    public int getAge() {
        return age;
    }

    public String getName() {
        return name;
    }
}