QuestionA.java

package Q13_07_Lambda_Expressions;

import java.util.ArrayList;
import java.util.List;

public class QuestionA {
	
	public static int getPopulation(List<Country> countries, String continent) {
 		int sum = 0;
 		for (Country c : countries) {
 			if (c.getContinent().equals(continent)) {
 				sum += c.getPopulation();
 			}
 		}
 		return sum;
	}
	
 	public static void main(String... args) {		
 		ArrayList<Country> countries = new ArrayList<Country>();
 		countries.add(new Country("United States", "North America", 1));
 		countries.add(new Country("Canada", "North America", 5));
 		countries.add(new Country("India", "Asia", 9));
 		
 		System.out.println(getPopulation(countries, "Asia"));
 	}

}