почему он считает, что некорректно работают методы

package com.javarush.task.task20.task2002;

import java.io.*;
import java.util.ArrayList;
import java.util.Date;
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("c:/users.txt", null);
            OutputStream outputStream = new FileOutputStream("c:/users.txt");
            InputStream inputStream = new FileInputStream("c:/users.txt");

            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");
        }
    }

    private static User.Country getCountry(){
        int i = (int) Math.round(1+Math.random()*3);
        switch (i){
            case 1 : return User.Country.UKRAINE;
            case 2 : return User.Country.RUSSIA;
        }
        return User.Country.OTHER;
    }

    private static Date getBirthDate(int i){
        Date birthDate = new Date();
        birthDate.setMonth((int)(Math.round(Math.random()*12)));
        birthDate.setDate((int)(i+Math.round(Math.random()*12)));
        return birthDate;
    }

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

        public void save(OutputStream outputStream) throws Exception {
            PrintStream ps = new PrintStream(outputStream);
            if (users != null) {
                for (int i = 0; i < users.size(); i++) {
                    ps.println(users.get(i).toString());
                }
            }
        }

        public void load(InputStream inputStream) throws Exception {
            BufferedReader buff = new BufferedReader(new InputStreamReader(inputStream));

            while (buff.ready()){
                String[] vals = getValues(buff.readLine());
                User user = new User();
                user.setFirstName(vals[0]);
                user.setLastName(vals[1]);
                user.setMale(getSex(vals[3]));
                user.setBirthDate(new Date(Long.parseLong(vals[2])));
                user.setCountry(User.Country.valueOf(vals[4]));
            }
        }

        private boolean getSex (String s){
            if (s.equals("m"))return true;
            else return false;
        }

        private String[] getValues (String s){
            String[] list = s.split("/");
            return list;
        }



        @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;
        }
    }
}