Сериализация. Human

Human.java

package humanSer;

import java.io.Serializable;

public class Human implements Cloneable, Serializable {

    public String name, sex;
    public transient int age;


    public Human(String name, int age, String sex) {
        this.name = name;
        this.age = age;
        this.sex = sex;
    }

    @Override
    public Object clone() throws CloneNotSupportedException {
        return super.clone();
    }

    @Override
    public String toString() {
        return name + " " + age + " " + sex;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }

        if (this.getClass() != obj.getClass()) {
            return false;
        }

        Human human = (Human) obj;
        return (this.name.equals(human.name)) && (this.age == human.age) && (this.sex.equals(human.sex));
    }
}

Main.java

package humanSer;

// Написать класс «человек». Реализовать его методы clone, equals, hashCode, toString.

import java.io.*;

public class Main {
    public static void main(String[] args) {

        Human chel1 = null, chel2 = null, chel3 = null;

        try {
            chel1 = new Human("Sasha", 26, "male");
            chel2 = (Human) chel1.clone();
            chel3 = new Human("Max", 37, "male");

            System.out.println(chel1.toString());
            System.out.println(chel2.toString());
            System.out.println(chel3.toString());

            System.out.println(chel1.equals(chel2));
            System.out.println(chel2.equals(chel3));

            System.out.println(chel1.hashCode());
            System.out.println(chel2.hashCode());
            System.out.println(chel3.hashCode());

        } catch (CloneNotSupportedException e) {
            System.out.println("Error");
        }


        try {
            FileOutputStream fos = new FileOutputStream("temp.out");
            ObjectOutputStream oos = new ObjectOutputStream(fos);

            try {
                oos.writeObject(chel1);
                oos.writeObject(chel2);
                oos.writeObject(chel3);

            } finally {
                oos.close();
            }

            Human newChel;
            FileInputStream fis = new FileInputStream("temp.out");
            ObjectInputStream ois = new ObjectInputStream(fis);

            try {
                newChel = (Human) ois.readObject();
                System.out.println(newChel.toString());

                newChel = (Human) ois.readObject();
                System.out.println(newChel.toString());

                newChel = (Human) ois.readObject();
                System.out.println(newChel.toString());
            } finally {
                ois.close();
            }
        } catch (IOException | ClassNotFoundException e) {
            e.printStackTrace();
        }

    }
}