Java Home Work - Samir Sir - Postal Code

// MainDoor.java
import java.util.HashMap;

class PostalCode {
    // properties
    int code;
    String area;

    void setPostalCode (String postArea, int postCode) {
        code = postCode;
        area = postArea;
    }
}

class Country {
    String countryCode;
    String subDomain;
    String countryName;
    String continent;
    String alternateName;
}

class Address {
    // Properties
    String houseName;
    String area;
    String city;
    String division;

    Country country;
    PostalCode postCode;

    // Actions / Functionality
    public void createAddress(String hname, String areas, String cities, String divisions, Country countries, PostalCode postalCode){
        houseName = hname;
        area = areas;
        city = cities;
        division = divisions;
        country = countries;
        postCode = postalCode;
    }

    public void showAddress() {
        System.out.println("House Name : " + houseName);
        System.out.println("Area : " + area);
        System.out.println("Postal Code : " + postCode.code);
        System.out.println("City : " + city);
        System.out.println("Division : " + division);
        System.out.println("Country : " + country.countryName);
        System.out.println();
    }
}

public class MainDoor {

    private static HashMap <String, Country> initiateCountries(HashMap <String, Country> countries) {
        Country country = new Country();
        country.countryName = "Myanmar";
        country.countryCode = "+089";
        country.continent = "Asia";
        country.subDomain = "mn";
        country.alternateName = "Burma";

        countries.put("Myanmar", country);

        country = new Country();
        country.countryName = "India";
        country.countryCode = "+091";
        country.continent = "Asia";
        country.subDomain = "in";
        country.alternateName = "Bharat";

        countries.put("India", country);

        country = new Country();
        country.countryName = "Bangladesh";
        country.countryCode = "+880";
        country.continent = "Asia";
        country.subDomain = "bd";
        country.alternateName = "Bangladesh";

        countries.put("Bangladesh", country);

        return countries;
    }

    private static HashMap <String, PostalCode> initiatePostalCodes(HashMap <String, PostalCode> postCodes) {
        // adding postal code
        PostalCode tempPostCode = new PostalCode();
        tempPostCode.setPostalCode("Sylhet Sadar", 3100);
        postCodes.put(tempPostCode.area, tempPostCode);

        tempPostCode = new PostalCode();
        tempPostCode.setPostalCode("Akhalia", 3114);
        postCodes.put(tempPostCode.area, tempPostCode);

        tempPostCode = new PostalCode();
        tempPostCode.setPostalCode("KajolShah", 3110);
        postCodes.put(tempPostCode.area, tempPostCode);

        tempPostCode = new PostalCode();
        tempPostCode.setPostalCode("Jalalabad", 3107);
        postCodes.put(tempPostCode.area, tempPostCode);

        tempPostCode = new PostalCode();
        tempPostCode.setPostalCode("Sylhet Biman Bondor", 3102);
        postCodes.put(tempPostCode.area, tempPostCode);

        return postCodes;
    }

    public static void main(String[] args)
    {
        HashMap <String, Country> countries = new HashMap <String, Country>();
        HashMap <String, PostalCode> postCodes = new HashMap <String, PostalCode>();
        countries = initiateCountries(countries);
        postCodes = initiatePostalCodes(postCodes);


        Address shanto = new Address();
        String houseName = "My Cool House";
        String areaName = "Akhalia";
        String cityName = "Sylhet Sadar";
        String divisionName = "Sylhet";
        String countryName = "Bangladesh";

        shanto.createAddress( houseName, areaName, cityName, divisionName, countries.get(countryName), postCodes.get(areaName) );

        shanto.showAddress();

        Address mehraj = new Address();
        houseName = "My Cool House";
        areaName = "KajolShah";
        cityName = "Sylhet Sadar";
        divisionName = "Sylhet";
        countryName = "Bangladesh";

        mehraj.createAddress( houseName, areaName, cityName, divisionName, countries.get(countryName), postCodes.get(areaName) );

        mehraj.showAddress();

    }
}