Serializable Employee

import java.io.*;

public class Main {

    public static void main(String[] args) {
        try(ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("person.dat")))
        {
            Employee e = null;
            oos.writeObject(e);
        }
        catch(Exception ex){

            System.out.println(ex.getMessage());
        }

    }

    public class Employee implements Serializable {
        public String name;
        public String address;
        public transient int SSN;
        public int number;
        public final int BIRTH_YEAR = 2000;
        public transient String password = "MyPassword2000";
        public String nickname;
        public static int dayOff;
        public void mailCheck() {
            System.out.println("Mailing a check to " + name + " " + address);
        }
    }

}