public class dataBase {


    public static void main(String... args) {

        user user1 = new user();
        user1.setName("Adam");
        user1.setSex(sex.MALE);
        user user2 = new user("Eva", sex.FEMALE);
        user user3 = new user("Cain");
        user3.setSex(sex.MALE);
        user user4 = new user();

        ArrayList<user> arr = new ArrayList<user>();
        arr.add(user1);
        arr.add(user2);
        arr.add(user3);
        arr.add(user4);

        for (user user : arr){
            new user().getInfo(user);
        }
    }
}

class user {

    private int id;
    private String name;
    private sex sex;


    private static final AtomicInteger COUNTER = new AtomicInteger(1);


    void getInfo(user user) {
        System.out.printf("ID:%3d %9s %6s\n", user.id, user.getName(), user.getSex());
    }


    String getSex() {
        try {
            return sex.toString();
        } catch (NullPointerException e) {
            sex = sex.UNDEFINED;
            return sex.toString();
        }
    }

    void setSex(sex sex) {
        this.sex = sex;
    }

    int getId() {
        return id;
    }

    String getName() {
        if (name == null) {
            name = "Unnamed";
        }
        return name;
    }

    void setName(String name) {
        this.name = name;
    }

    user() {
        this.id = COUNTER.getAndIncrement();
    }

    user(String name) {
        this.id = COUNTER.getAndIncrement();
        this.name = name;

    }

    user(String name, sex sex) {
        this.id = COUNTER.getAndIncrement();
        this.name = name;
        this.sex = sex;

    }

}