PrimitiveObsession.java

class Employee {
    private int id;
    private int yearOfBirth;
    private int monthOfBirth;
    private int dateOfBirth;
    private String addressFlat;
    private String addressStreet;
    private String city;
    private String state;
    private String pincode;
    private String country;

    public Employee(int id, int yearOfBirth, int monthOfBirth,
                 int dateOfBirth, String addressFlat,
                 String addressStreet, String city,
                 String state, String pincode, String country) {
        this.id = id;
        if(yearOfBirth > 2003) {
            throw new IllegalArgumentException("Employee must be at least 18 years old")
        }
        this.yearOfBirth = yearOfBirth;
        if(monthOfBirth < 1 || monthOfBirth > 12) {
            throw new IllegalArgumentException("There are only 12 months in a year!!");
        }
        this.monthOfBirth = monthOfBirth;
        if(dateOfBirth < 1 || dateOfBirth > 31) { // Ignore leap year/month logic
            throw new IllegalArgumentException("There are at max 31 days in a month!!");
        }
        this.dateOfBirth = dateOfBirth;
        if(addressFlat == null || addressFlat.length() < 1) {
            throw new IllegalArgumentException("That seems like a short flat number!!");
        }
        this.addressFlat = addressFlat;
        if(addressStreet == null || addressStreet.length() < 5) {
            throw new IllegalArgumentException("That seems like a short flat number!!");
        }
        this.addressStreet = addressStreet;
        if(city == null || city.length() < 3) {
            throw new IllegalArgumentException("Seems like an invalid city name!!");
        }
        this.city = city;
        if(state == null || state.length() < 3) {
            throw new IllegalArgumentException("That seems like a short flat number!!");
        }
        this.state = state;
        if(pincode == null || pincode.length() < 7) {
            throw new IllegalArgumentException("Pin code is invalid!!");
        }
        this.pincode = pincode;
        if(country == null || country.length() < 3 || BlacklistedCountries.contains(country)) {
            throw new IllegalArgumentException("Incorrect or blacklisted country!!");
        }
        this.country = country;
    }
    // Other methods as necessary
}

class BlacklistedCountries {
    public static String[] get() {
        return new String[]{"Mordor", "Isengard", "Angmar"};
    }

    public static boolean contains(String country){
        return Arrays.stream(BlacklistedCountries.get()).anyMatch(country::equals);
    }
}