//Jesus answered him, "Do you say this by yourself, or did others tell you about me?" (John 18:34)

----------------------------------------------------Solution.java-------------------------------------------------------------
package com.javarush.task.task20.task2002;

import java.io.*;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.*;

public class Solution {
    public static void main(String[] args) {
        
        try {
            File your_file_name = new File("d:\\5.txt");
            OutputStream outputStream = new FileOutputStream(your_file_name);
            InputStream inputStream = new FileInputStream(your_file_name);

            JavaRush javaRush = new JavaRush();
            User usr = new User();
            usr.setFirstName("Ivan");
            usr.setLastName("Ivanov");
            usr.setBirthDate(new GregorianCalendar(1980, 11, 25).getTime());
            usr.setCountry(User.Country.RUSSIA);
            usr.setMale(true);

            javaRush.users.add(usr);

            javaRush.save(outputStream);
            outputStream.flush();

            JavaRush loadedObject = new JavaRush();
            loadedObject.load(inputStream);

            outputStream.close();
            inputStream.close();

        } catch (IOException e) {
            
            System.out.println("Oops, something wrong with my file");
        } catch (Exception e) {
            
            System.out.println("Oops, something wrong with save/load method");
        }
    }

    public static class JavaRush {
        public List<User> users = new ArrayList<>();

        public void save(OutputStream outputStream) throws Exception {
            
            DataOutputStream outToFile = new DataOutputStream(outputStream);

            outToFile.writeInt(users.size());
            for (User user : users) {
                
                String firstName = (user.getFirstName() == null) ? "null" : user.getFirstName();
                outToFile.writeUTF(firstName);
                String lastName = (user.getLastName() == null) ? "null" : user.getLastName();
                outToFile.writeUTF(lastName);
                outToFile.writeLong(user.getBirthDate().getTime());
                outToFile.writeBoolean(user.isMale());
                outToFile.writeUTF(user.getCountry().name());
            }
            outToFile.flush();
        }
    public void load(InputStream inputStream) throws Exception {
        DataInputStream fromFile = new DataInputStream(inputStream);
        int usersCount = fromFile.readInt();
        for (int i = 0; i < usersCount; i++) {
            User user = new User();
            String firstName = fromFile.readUTF();
            if (firstName.equals("null")) firstName = null;
            user.setFirstName(firstName);
            String lastName = fromFile.readUTF();
            if (lastName.equals("null")) lastName = null;
            user.setLastName(lastName);
            user.setBirthDate(new Date(fromFile.readLong()));
            user.setMale(fromFile.readBoolean());
            user.setCountry(User.Country.valueOf(fromFile.readUTF()));

            users.add(user);
        }
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        JavaRush javaRush = (JavaRush) o;

        return users != null ? users.equals(javaRush.users) : javaRush.users == null;

    }

    @Override
    public int hashCode() {
        return users != null ? users.hashCode() : 0;
    }
  }
}
------------------------------------------------------------------------------------------------------------------------------



------------------------------------------------------User.java---------------------------------------------------------------
package com.javarush.task.task20.task2002;

import java.util.Date;

public class User {
    private String firstName;
    private String lastName;
    private Date birthDate;
    private boolean isMale;
    private Country country;

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public Date getBirthDate() {
        return birthDate;
    }

    public void setBirthDate(Date birthDate) {
        this.birthDate = birthDate;
    }

    public boolean isMale() {
        return isMale;
    }

    public void setMale(boolean male) {
        isMale = male;
    }

    public Country getCountry() {
        return country;
    }

    public void setCountry(Country country) {
        this.country = country;
    }

    public static enum Country {
        UKRAINE("Ukraine"),
        RUSSIA("Russia"),
        OTHER("Other");

        private String name;

        private Country(String name) {
            this.name = name;
        }

        public String getDisplayedName() {
            return this.name;
        }
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        User user = (User) o;

        if (isMale != user.isMale) return false;
        if (firstName != null ? !firstName.equals(user.firstName) : user.firstName != null) return false;
        if (lastName != null ? !lastName.equals(user.lastName) : user.lastName != null) return false;
        if (birthDate != null ? !birthDate.equals(user.birthDate) : user.birthDate != null) return false;
        return country == user.country;

    }

    @Override
    public int hashCode() {
        int result = firstName != null ? firstName.hashCode() : 0;
        result = 31 * result + (lastName != null ? lastName.hashCode() : 0);
        result = 31 * result + (birthDate != null ? birthDate.hashCode() : 0);
        result = 31 * result + (isMale ? 1 : 0);
        result = 31 * result + (country != null ? country.hashCode() : 0);
        return result;
    }
}
------------------------------------------------------------------------------------------------------------------------------
/*
Читаем и пишем в файл: JavaRush
Реализуйте логику записи в файл и чтения из файла для класса JavaRush.
В файле your_file_name.tmp может быть несколько объектов JavaRush.
Метод main реализован только для вас и не участвует в тестировании.


Требования:
1. Логика чтения/записи реализованная в методах save/load должна работать корректно в случае, если список users пустой.
2. Логика чтения/записи реализованная в методах save/load должна работать корректно в случае, если список users не пустой.
3. Класс Solution.JavaRush не должен поддерживать интерфейс Serializable.
4. Класс Solution.JavaRush должен быть публичным.
5. Класс Solution.JavaRush не должен поддерживать интерфейс Externalizable.

----------------------------------------------------Solution.java-------------------------------------------------------------
package com.javarush.task.task20.task2002;

import java.io.*;
import java.util.ArrayList;
import java.util.List;

* 
Читаем и пишем в файл: JavaRush
*
public class Solution {
    public static void main(String[] args) {
        //you can find your_file_name.tmp in your TMP directory or fix outputStream/inputStream according to your real file location
        //вы можете найти your_file_name.tmp в папке TMP или исправьте outputStream/inputStream в соответствии с путем к вашему реальному файлу
        try {
            File your_file_name = File.createTempFile("your_file_name", null);
            OutputStream outputStream = new FileOutputStream(your_file_name);
            InputStream inputStream = new FileInputStream(your_file_name);

            JavaRush javaRush = new JavaRush();
            //initialize users field for the javaRush object here - инициализируйте поле users для объекта javaRush тут
            javaRush.save(outputStream);
            outputStream.flush();

            JavaRush loadedObject = new JavaRush();
            loadedObject.load(inputStream);
            //check here that javaRush object equals to loadedObject object - проверьте тут, что javaRush и loadedObject равны

            outputStream.close();
            inputStream.close();

        } catch (IOException e) {
            //e.printStackTrace();
            System.out.println("Oops, something wrong with my file");
        } catch (Exception e) {
            //e.printStackTrace();
            System.out.println("Oops, something wrong with save/load method");
        }
    }

    public static class JavaRush {
        public List<User> users = new ArrayList<>();

        public void save(OutputStream outputStream) throws Exception {
            //implement this method - реализуйте этот метод
        }

        public void load(InputStream inputStream) throws Exception {
            //implement this method - реализуйте этот метод
        }

        @Override
        public boolean equals(Object o) {
            if (this == o) return true;
            if (o == null || getClass() != o.getClass()) return false;

            JavaRush javaRush = (JavaRush) o;

            return users != null ? users.equals(javaRush.users) : javaRush.users == null;

        }

        @Override
        public int hashCode() {
            return users != null ? users.hashCode() : 0;
        }
    }
}
------------------------------------------------------------------------------------------------------------------------------



------------------------------------------------------User.java---------------------------------------------------------------
package com.javarush.task.task20.task2002;

import java.util.Date;

public class User {
    private String firstName;
    private String lastName;
    private Date birthDate;
    private boolean isMale;
    private Country country;

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public Date getBirthDate() {
        return birthDate;
    }

    public void setBirthDate(Date birthDate) {
        this.birthDate = birthDate;
    }

    public boolean isMale() {
        return isMale;
    }

    public void setMale(boolean male) {
        isMale = male;
    }

    public Country getCountry() {
        return country;
    }

    public void setCountry(Country country) {
        this.country = country;
    }

    public static enum Country {
        UKRAINE("Ukraine"),
        RUSSIA("Russia"),
        OTHER("Other");

        private String name;

        private Country(String name) {
            this.name = name;
        }

        public String getDisplayedName() {
            return this.name;
        }
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        User user = (User) o;

        if (isMale != user.isMale) return false;
        if (firstName != null ? !firstName.equals(user.firstName) : user.firstName != null) return false;
        if (lastName != null ? !lastName.equals(user.lastName) : user.lastName != null) return false;
        if (birthDate != null ? !birthDate.equals(user.birthDate) : user.birthDate != null) return false;
        return country == user.country;

    }

    @Override
    public int hashCode() {
        int result = firstName != null ? firstName.hashCode() : 0;
        result = 31 * result + (lastName != null ? lastName.hashCode() : 0);
        result = 31 * result + (birthDate != null ? birthDate.hashCode() : 0);
        result = 31 * result + (isMale ? 1 : 0);
        result = 31 * result + (country != null ? country.hashCode() : 0);
        return result;
    }
}
------------------------------------------------------------------------------------------------------------------------------
*/