public class CountryTest {

 public static void main(String[] args) {

 Country countryObj1 = new Country("Japan", "Tokyo", 126440000);
 Country countryObj2 = new Country("Czech Republic", "Prague", 10610947);
 Country countryObj3 = new Country("Canada", "Ottawa", 37412852);

 List<Country> countryList = new ArrayList<>();

 countryList.add(countryObj1);
 countryList.add(countryObj2);
 countryList.add(countryObj3);

 CountryHelper countryHelper = new CountryHelper();

 // approach 1:
 List<Country> countryNamesList = countryHelper.getCountryNameStartsWithC(countryList);
 List<Country> countryPopulationList = countryHelper.getCountryPopulationMoreThan100Million(countryList);

 for(Country country : countryNamesList) {
    System.out.printf("Country Names Starts With Letter C: %s \n", country);
 }

 for(Country country : countryPopulationList) {
    System.out.printf("Country Names MORE Than 100 Million %s \n", country);
 }

 }
}