iteration on hasmaps

 import java.util.*;

public class IterationOnHashMap {

    public static void main(String[] args) {

        HashMap<String, Integer> hm = new HashMap<>();

        hm.put("India", 100);

        hm.put("China", 150);

        hm.put("USA", 75);

        hm.put("UK", 50);

        Set<String> keys = hm.keySet();

        for (String k : keys) {

            System.out.println("Country: " + k + " population: " + hm.get(k));

        }

    }

}