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import java.io.*;
import java.util.ArrayList;
import java.util.stream.Stream;

class Car implements Serializable {
    private String make;
    private String model;

    public Car(String make, String model) {
        this.make = make;
        this.model = model;
    }

    public Car() {
        this("Mercedes-Benz", "C300");
    }
}

class Person implements Serializable {
    private String name;
    private int age;
    private Car car;

    public Person(String name, int age) {
        this.name = name;
        this.age = age;
        this.car = new Car();
    }

    public void setCar(Car car) {
        this.car = car;
    }

    @Override
    public String toString() {
        return "Person{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }

    public int getAge() {
        return age;
    }
}

public class SerializingObjects {
    public static void main(String[] args) {
        Person p1 = new Person("Johnny", 55);
        Person p2 = new Person("Arthur", 38);
        p2.setCar(new Car("Audi", "A4"));

      //This Stackoverflow question was referenced while serialization functionality was being implemented.
      //https://stackoverflow.com/questions/12684072/eofexception-when-reading-files-with-objectinputstream
        
        String fileName = "people.txt";
        //Time to serialize
        try (
                FileOutputStream fos = new FileOutputStream(fileName);
                ObjectOutputStream oos = new ObjectOutputStream(fos)
        ) {
            Stream.of(p1, p2, null).forEach(person ->
                    //NULL indicates the end of the stream (no more objects to send)
            {
                try {
                    oos.writeObject(person);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            });
        } catch (IOException e) {
            e.printStackTrace();
        }

        //Time to deserialize
        ArrayList<Person> people = new ArrayList<>();
        try (
                FileInputStream fis = new FileInputStream(fileName);
                ObjectInputStream ois = new ObjectInputStream(fis);
        ) {
            Object o = ois.readObject();
            while (o != null) {
                people.add((Person) o);
                o = ois.readObject();
            }
        } catch (IOException | ClassNotFoundException e) {
            e.printStackTrace();
        }

        people.stream().forEach(System.out::println);
    }
}